Customizable Adjustable Glass Bed Bracket for FlashForge Creator Pro etc

by DrLex, published

Customizable Adjustable Glass Bed Bracket for FlashForge Creator Pro etc by DrLex Dec 7, 2016
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Yes, there's quite a bit of text here, but it's worth it to read all of it. Even if you're familiar with Customizer and printing strong heat-resistant parts, you should still read the ‘Mounting’ and ‘Using’ sections for some important hints.


Yet another iteration of the adjustable glass bed bracket, originally by chewbone and then modified by omegatron and Lochemage. This time, not only the bracket itself is adjustable, so is the model! This customizable bracket fits the FlashForge Creator Pro and printers with similar build plates with M3 bolts at their corners. The adjustable knob makes it is easy to swap out glass plates if you have more than one, so you can start printing on another plate while the first one is still cooling down.

The main advantage of this design is that it allows to mount the glass plate without anything sticking out above it. This means you never need to worry about the risk of your nozzles crashing into the brackets. This particular remix improves upon the originals by avoiding to sandwich the bracket between the bed and the nut. This offers a more balanced mount when tightening the knob, while also making it easier to move the bracket.

If you have yet to buy a glass plate, try to find one that is just a few millimeters smaller than the bed, and has rounded or beveled edges. Such plates work best with these brackets. Borosilicate glass is highly preferred over regular glass. Avoid plates thicker than 4 mm: they will take long to heat, and because glass is a rather good thermal insulator, their surface temperature will be a lot lower than expected.

Obvious disclaimer: I am not responsible for any possible damage caused by the use of these brackets, not if you follow my advice, and certainly not if you ignore it.

Creating a customized bracket

Do not just print the example STL file, it is unlikely to fit your setup. Instead, use Customizer to generate brackets that match your particular bed and glass dimensions. It is limited to plates roughly the same width and depth as the heated bed itself.
If Customizer is broken on the Thingiverse website, here are instructions to run it on your own computer.

Measure the width, depth and height (in other words X, Y and Z dimensions) of both the bed (without glass) and glass plate(s). Next, enter those values in the corresponding fields in Customizer. Be as accurate as possible! Aim for at least 0.5 mm accuracy, this is possible with a simple ruler and a keen eye.
If you have multiple supposedly “identical” plates, there will often be small differences between them: take the minimum width and depth across all plates.

You can opt to mount the brackets on the front right and rear left corners, or front left and rear right. One pair of brackets is sufficient, but should you want to clamp all corners anyway, just run Customizer twice for both configurations. The models are marked so you know where to mount them: FR = front right, FL = front left, RL = rear left, RR = rear right.

The default is to center the glass on the bed, but if you want to align one of its edges to an edge of the print bed, you can select that in the options. For instance, I have aligned mine to the front edge because my start G-code chops off oozed filament on that edge.

You can choose to add an extra pair of tiny ridges that may help to keep the plate clamped down. This is most useful if your glass plate has rounded or beveled edges, an explanation can be found at the bottom of this page.

The option ‘Rear Corner Fix’ in the advanced settings (enabled by default) compensates for an oddness of the FFCP (at least mine). Check the photo at the bottom of this page to see whether you need to disable this option or not.

If the generated 3D model shows “FAIL,” then either you've entered non-numerical dimensions, or your glass plate is unfortunately too large or small to be compatible with the brackets. You can try to fiddle with the advanced settings if the dimensions are borderline, but it is advisable to find some other glass instead, that has nearly the same size as the bed.

(Note: the preview in Customizer can look a bit messy. This has no impact on the final result.)


This must be printed in a material that can withstand the heat of the heated bed! See the ‘Print settings’ section for more details.

Next to the customized bracket model you created above, you must also print one pin and one nut (knob) per bracket. If you choose to print the ‘CoarseThread’ version of the pin (easier print but rougher adjustment), you must also print the CoarseThread version of the nut.
The regular pin comes in two variations: a solid one, and one with hollow thread section. The latter is less likely to warp during printing, therefore print this one unless you have a good reason to print the solid one. (There is no hollow version of the CoarseThread because its shape leaves no room for a hollow space.)

There are XL versions of the pins, these are slightly longer than the normal ones. Only print these if necessary, because printing them in ABS or PC will be even more difficult than the shorter ones. If these still are too short, you definitely need to find a glass plate that more closely matches the size of the heated bed.

The nuts come in two sizes. The larger is the recommended one, but you may need the smaller one if you have a thin bed and the knob sticks out above the glass.

If you're willing to spend a little extra time molding silicone gaskets or printing them with a flexible filament, it is well worth it to print the improved spring-loaded knobs instead of the plain ones from this Thing. The springs reduce the risk that the glass shifts around due to thermal expansion of the heated bed. (You don't need an extra set of plain knobs to already use the brackets while waiting for the silicone gaskets to cure. Just use the spring-loaded knobs without gaskets in the same way as the ordinary knobs, and insert the gaskets afterwards.)


This design differs from the originals it was remixed from, in that you do not need to unscrew any of the existing nuts or bolts. Instead, you need an additional M3 nut per pin. I recommend to use nyloc nuts. Mount the pin with the recess upwards, covering the existing M3 nut, and tighten the pin with the extra nut (this tool may come in handy). See the rendered 3D image in the photo gallery for an illustration of how the complete assembly fits together. (Again, even though this image shows the screws separately, you do not need to remove them. This was only rendered as such to help people who are building their printer from scratch.)

Important: only tighten the M3 nut just to the point where the pin can no longer move vertically. Do not tighten it further, unless you printed the pin in polycarbonate or will never heat the bed anywhere near 110°C.

If you don't have any M3 nuts to spare, you can also print the pin from the original thing and mount it using the existing nut, with the recess downwards. I do recommend using my version of the pin if possible.


If you use the spring-loaded knobs, read the instructions on their page and skip the following paragraph because those knobs make it redundant.

Otherwise, the correct workflow is to first preheat your bed with the glass plate on top, and only tighten the knobs when the temperature is stable. The reason is that borosilicate glass has a much lower thermal expansion coefficient than the bed, therefore if you would tighten it cold and then heat, the bed will become larger w.r.t. the plate, and it may be loose enough to wiggle around. The whole point of these brackets is that it is very easy to adjust them, so it is better to adjust them when it is not really necessary, than not to adjust them when it is needed.

Do not tighten the knobs like crazy. Just tighten them up to the point where the glass cannot move. Over-tightening may cause the plastic to deform, or the plate to lift if you did not print the brackets with accurate dimensions.

Should you remove the blue sheet or BuildTak when using a glass plate?

If you don't foresee that you will ever print on the sheet again, you should remove it. The sheet acts as an insulator and will cause a drop in temperature between the bed and glass, as much as 10°C depending on the temperature and thickness of the sheet. One small advantage of leaving the sheet installed, is that it provides some friction, making it less easy for the glass to slide around than on the bare metal surface. However, it should be the brackets that keep your glass in place, not the surface.

Print Settings

Printer Brand:








0.1 mm and 0.2 mm


25% and 100%


The model that comes out of Customizer is ready to print without supports. The worst overhangs are 45°, which should be easy to print if you have tuned your printer well. A fan can help with the overhangs, but make sure to print hot and slowly if you print ABS with a fan.

I printed the nuts and pins at 0.1 mm, the bracket at 0.2 mm. I printed extra slowly for additional strength. I used a brim on the corner pieces, but this was probably unnecessary. Print the pins at 100% infill. Infill for the other parts doesn't really matter, but I do recommend to print them with 3 perimeters for strength. To get the best detail on the threads of the pin, print slowly with the fan enabled if necessary. If you really have trouble printing the pins, you can try printing them upright, or use the ‘CoarseThread’ versions instead.

The material choice is important. Most crucial are the pins, because they are pushed against the heated bed, hence must be the most heat-resistant. What material you need, depends on the maximum temperature to which you will heat the bed during everyday use.
From best to worst, here are some choices for the most common filaments:

  • Polycarbonate (PC): this is an excellent material because it can withstand all reasonable heated bed temperatures, therefore if you print the brackets with it, you will never have to worry about the bed temperature. I would recommend it if you will often print ABS at bed temperatures near 110°C. Unfortunately PC is difficult to print with. The minimum extruder temperature is 260°C. You need an all-metal hot-end to print at that temperature, because the teflon liners in standard hot-ends will quickly degrade at that temperature, releasing toxic fumes. You can of course order a PC print through 3DHubs. If price is an issue, it is OK to have only the pins printed in PC, and print the brackets and knobs yourself in ABS.
  • ABS: this is a good material because it will not deform easily below 110°C. If you will mostly print PLA and PETG, and only occasionally ABS, then printing the brackets in ABS is perfectly OK. You might need to print new pins from time to time because they may bend after a while. To minimize deformation, always follow the instructions from the Mounting and Using sections!
  • PETG: this is good if you will never heat the bed above 75°C, e.g. if you'll only print PLA and occasionally PETG. Don't use it if you will ever have to do an ABS print though.
  • PLA: I would not recommend this, unless you'll never heat the bed above 55°C. If you would ever need to heat the bed above 60°C, your PLA pins and brackets will deform or melt.

I have used ABS printed pins for about half a year, after this they were somewhat bent but still usable. I printed new pins in polycarbonate, and I expect those to last forever.

If you're the AvE kind of guy and have the tools and skills for metalworking, an alternative to obtain perfectly heat-resistant pins, is to buy stainless steel M8 x 1.25 bolts and transform them into the shape of the pins, or create the shape from scratch. Stainless steel is ideal due to its low thermal conductivity, which reduces the need for heat-resistance of the other parts of the bracket.

How I Designed This

I took omegatron's model, cleaned it up in Blender, and chopped off all the parts that would vary when making it customizable. I exported it to STL, and converted this to an OpenSCAD polyhedron using stl2scad, because Customizer does not allow importing STL files. Then I added the necessary customizable shapes using the usual SCAD magic.

‘GlassBedNut-v3’ is the same shape as the original, although I cleaned up the STL a bit to avoid weird glitches in Slic3r.



I updated the pin model to be longer at the side of the bed. This should make it more resistant against deformation. If you print new pins, be sure to use this new model. Remember: do not tighten the pins any harder against the bed than necessary. Otherwise you'll end up with the counter-intuitive situation where the pin becomes the more loose, the more you tighten it.
Included ‘divided’ variation of the pin model (this had a cavity that might allow to print the threaded part with less infill, however this was unpractical so I removed it again).


Allowed larger range of values in customizer: bed thickness can now go down to 5 mm and tabs can go up to 7 mm.


Added smaller nuts and coarse-threaded variants (using the same threads as Lochemage's remix of the original brackets).


Completely overhauled Customizer so it is much easier to use, and offers a wider range of parameters.
Created Spring-loaded Knobs remix, which I highly recommend over the plain knobs.


Added ‘Rear Corner Fix’.
2017/06/04: Bumped default tabWidthOffset from 1.2 mm to 1.5 mm.


Added a version of the regular pin with the threaded section hollowed-out. This makes it less likely to warp when printed in ABS or polycarbonate.
Fixed the broken preview in Customizer/OpenSCAD.
Minor update 2017/07/25: made error messages in customizer preview more readable.


Added XL versions of the pins, these are about 6mm longer.
Wasted some of my precious time due to the stupid “Token Expired” bug in the Thingiverse site. If this kind of crap keeps happening, I'll just stop uploading models altogether.

When to use the ‘Extra ridges’ option

The extra ridges can keep the glass down if it has enough of a bevel or rounded edge.

If your glass has beveled or rounded edges, it is worth it to enable the ‘Extra ridges’ option in Customizer. As the figure shows, the ridges can clamp down the glass by grabbing it on the bevel. This is not strictly necessary when using borosilicate glass, but regular glass or other materials that have a significant coefficient of expansion, are more likely to warp and lift at the edges when the bed is heated.

If you want to have the same clamp-from-above effect with glass that has straight edges, you can only do so by ignoring my advice of never letting anything stick out above the glass. If you make the brackets about 0.2 mm taller than the glass and enable the ridges, they will also clamp the glass from above. This is not worth the risk however: trying to clamp down the glass is pointless if you follow my usage instructions.

When to enable/disable the ‘Rear Corner Fix’ option

Check the bottom side of your heated bed at the rear (hint: use a mirror or take a snapshot with your smartphone) and compare it to the photo. If the screws look like in the left photo, you don't need to change anything to the defaults. If they look like in the right photo, disable the ‘Rear Corner Fix’ in the advanced settings.

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Thanks, this thing is awesome! So much better than binder clips. I had to edit the SCAD file to allow for a smaller glass plate (200x213 glass on 214x214 build plate), but it worked beautifully after that.

Customiser not working, can't access files from thingiverse.

Hi, I really like this! I was just wondering what is the specs for the thread?

The answer is actually buried somewhere in the description: M8 x 1.25 for the fine thread. I don't know what the coarse thread is.

Thank you! I can't believe I missed that. I searched the description up and down and never saw that

I tried using the customizer but keeping having an error. .Here is the error I'm getting #<RuntimeError: Failed to get https://www.thingiverse.com/download:3944809 403.

Yes, I also see this and it happens with all customizers. You should report this to Thingiverse.

Thank you for your response. I did notified Thingiverse and I got response saying Yes I have a problem but that is all. I just sent another reponse to them. I hope they will fix the problem. I’m looking forward in getting your glass bed brackets.

I am getting those errors also.

What you can do, is download the latest development snapshot of OpenSCAD and open the .scad file from this thing in it. It has a customizer feature built-in (see the View menu). Or, you can just edit the values in the file itself. When ready, click the ‘Render’ button, then the ‘STL’ button.

I reported twice to Thingiverse but got only one response on the first one. All was written was that I had errors. Did you contact Thingiverse.? Just wondering.

Maybe i'm a special kind of stupid.
But how does it mount to the bed exactly?
Does it need to be a bed with countersunk holes?
Because if I chug a bolt down from the top of the bed, through the pin and then add a nyloc nut, then at the gap where the bed shoud fit, the bolt's head now collides with the edge.

You will need a countersunk hole and screw indeed, such that nothing sticks out above the bed.
An alternative would be to make a gap in the glass for the bolt head, but you probably don't want to try that unless you have experience with cutting glass.
Within a few days I'll make a diagram of how everything is supposed to be mounted, because I notice people are using this model for printers different from the FlashForge Creator Pro for which it was originally designed.

Okay. No i'd rather not do that. I think i'll just drill a countersunk hole in the bed instead.
Thank you for your reply!

I've had loads of issues with the silicon gaskets. When I finally got something that actually dried properly (and didn't tear apart when I pulled it out), it seems that the silicon is entirely too soft, and certainly not firm enough to hold a glass plate in place.

I wonder how things would work if I just printed a couple of ID 10mm, OD 14mm ,4mm high "square" rings using TPU. Any thoughts?

That is definitely worth a try, if it is flexible enough it should work. You may need to experiment a bit with the thickness of the ring, it shouldn't fill the gap entirely to allow it to deform while being compressed.
My molded rings work pretty well, they were also much softer when they came fresh out of the molds, but they obviously kept outgassing during the next few weeks because they got a lot stiffer and shrunk a bit as well. Due to the shrinkage, I should add mold for 4mm high rings, and drop the 3mm model because it is next to useless.

TPU printed at 0.2, 2 bottom layers, 3 top layers, 1 perimeter, 10% fill. The model was a quick tinkercad "ring" that was 4mm tall, 14mm OD and 11mm ID. It's kind of stiff, but I can't go lower than 1 perimeter (and the 10% infill is just so the top layer has something to rest on.) It does work, however. :)

I might try again with a slightly thinner "ring" (11.5 ID, 13.5 OD), to give it room to bulge, but that also leaves less room for infill. (Maybe I should modify the "nut" model to allow for a thicker gasket..hmm..)

Thank you!

Nice, I think it is safe to use 0% infill because the gap that has to be bridged for the first top infill layer is tiny anyway. I have some Ninjaflex samples lying around, I may try this myself.
In the meantime I have molded some new gaskets with the 4 mm high mold I recently added, and indeed it takes quite a while before the silicone cures. I think it is mandatory to place the molds in a very humid environment to let the rings cure in reasonable time, because silicone compound cures due to contact with water.

I tried about 5 different styles of glass bed clips/clamps/brackets since I got my Qidi Tech 1 and a borosilicate glass sheet to go with. I'd been using some small metal spring clamps (with insulated tips) up until now, they did sort of work but occasionally caused the nozzles to crash into them, and occasionally even popped off, ruining more than a couple of prints, so I'd pretty well stopped using the glass completely until I found these.

My glass is almost exactly the same size as my aluminium bed, and I measured both the aluminium and glass accurately and plugged the numbers in. On that first version, the 'lips' on the brackets came out way too big, I do not know why, and consequently didn't fit at all. I re-ran the customizer and added 2 or 3mm to the glass size, which pretty well removed the 'lips' completely (which is what was needed) and these now work brilliantly!

So don't know why the customiser didn't get this right with the glass size exactly the same as the bed size? Would be curious to find out. All in all though, these are the best thing I've come across so far and I can see myself using the glass often now particularly for ABS prints, and it's dead easy to take the brackets off (leaving the pins bolted in place with M3 nylocs, as suggested) for when I'm printing PLA on the blue pad, which is fine.


It is possible the bolts on your particular bed are positioned somewhat differently than on mine, after all it is a clone. Or maybe you did not need the ‘rear corner fix’ which is enabled by default (see the bottom of the thing description page). But since you're happy with your current print, I guess you no longer need to try fiddling with the options :)

Well the gaskets didn't work... 24 hours layer and the silicone hadn't even begun to set so all I got was a gummy mess.

I did use low-modulus silicone though, not the stuff that smells like vinegar - I wonder if the cure time is different or something. What did you use again? I don't see how much air can get to it to cure once they're clamped together anyway!

I used cheap house brand generic silicone from a local store, of the ‘neutral’ kind (the one that smells like some kind of solvent). Not sure what is the modulus rating of this stuff. Low modulus might be too flexible for this application, although you could compensate for it by making custom gaskets that are thicker.

Silicone cures due to exposure to humidity, so you can try placing the filled mold inside a damp environment. It doesn't need to be soaked, just sealing it in a plastic bag with a few drops of water should be sufficient to cause it to cure quicker. I recommend to leave the gaskets alone for an additional 24 hours after removing them from the molds, to allow them to outgas and become more stiff.

If you want to further improve curing, you can make your own mold with more or larger vent channels. Use the customizable mold maker with rounded square shape, inner diameter of 10 mm, and outer 14.1 mm. As for the thickness, you may want to use 4mm instead of 3.5mm, especially when using low modulus silicone, because I have noticed that even 3.5mm doesn't offer an awful lot of springiness after the gaskets have cured and shrunk a little. (I need to update the thing page some day…)

Customizable Gasket Mold Maker
by DrLex

The glass ive ordered is 232 x 154mm and my bed is 230 x 150mm will this bracket take up that much slack?

Yes, if you enter those values in Customizer, you'll get brackets that will fit.

thank You for the nice work. In my case the only problem is the length of the pins. My glass is little bit larger and the customized version only adjusts the form of the corners, not the length of the pins :-(

I have added new ‘XL’ pins that are about 6mm longer, if that isn't enough then you should try to find a better matching glass plate, because making the pins any longer will greatly increase the risk that they will bend.

HI and thanks for this! :)
I've got a ffcp 2016 with blue sticker removed as I hated it.. got two glass sheets from same firm.. weirdly one has rounded off corners other doesnt, Bed 153x232 by my amateurish measuring lol and glass is 153x235 (rounded corner glass) so oeverhangs slightly at sides. Can I use this bracket? Cheers.

Yes, you can. If you want to mount the brackets on the front right and rear left, customize them with a ‘Tab Width Left’ of 0mm, and a ‘Tab Width Right’ of 1.5mm. If you want them on the front left and rear right, swap those two values.
I'll try to update the customizer one of these days so you only need to fill in your bed and glass dimensions, and it will either do the rest or say it won't work, instead of having to do all the calculations yourself.

Nope, do you intend to use those to improve heat transfer to the glass? I'm not sure if it will make a big difference.

Someone on a Facebook group uses it to secure the glass! I've ordered one I'll post back.

The sheet I posted above is a huge success. I have no brackets holding the glass whatsoever!

is this one good for a 10x9 or (255mmx230mm) gas bed?
if not dose someone have a solution for my FFCP2016 and 10x9 gas bed?

No, you cannot mount a glass plate that large with these clips. In fact you'll have a hard time mounting it in any way, and there is no real point in using such a large plate to begin with. The nozzles cannot go beyond the original 230x155 bed by more than a few millimeters, so you won't gain much printing volume. These clips are optimal for a glass plate that is nearly the same size as the aluminium bed.

I printed this out, and I'm seeing a problem. My glass is not really held in place (because the clips don't reach it) and it lifts up during printing. That my be just because I'm using plexi glass instead of tempered, but if you know the solution please help me.

I've replaced the plexi glass with tempered glass, but now the problem is that I don't get good adhesion in the middle because there glue on there, and the clips still don't hold it in place. I think it's just a little bit too big so that one of the clips is not on the bed. Any suggestions on that?

If there is any residue on the glass, remove it with acetone. Less sticky greasy stuff can be easily removed with isopropanol.
I'm not sure I understand what you mean with ‘one of the clips is not on the bed’. A photo would help.

If you do want to try to go on with the plexiglass, it does have the advantage that you can tool and sand it. To make the brackets really grab the plate from above, bevel the edges of the plates (sand off about 3/4 of a millimeter off the edges at a 45° angle), and customize the brackets with the ‘extra ridges’ enabled. This will cause them to grab those beveled edges and clamp down the plate. However, the plexi may still have enough force due to thermal expansion, that it will lift the brackets, so I would again recommend to use real glass instead.

Have you merely printed the default STL models, or created custom ones with the Customizer button? I'm just wondering because if you have created custom models according to the instructions, and use them according to the instructions, then they should fit and grab the plate. I'm starting to suspect that quite a few Thingiverse users don't even realize that Customizer exists…

Plexiglass seems like a bad choice for a print bed. It will flex when heated, because one side will be considerably warmer than the other one, which probably explains why it lifts. Also, it is by far not as resistant to wear as glass, and some filaments may fuse with it. You definitely should get a glass plate. Borosilicate is not essential, but recommended nonetheless.

Thank you for posting this along with the scad file. Superior design compared to all other clips I've found, including my own remix of another. Too many good prints ruined by a small shift in the glass bed.

Hey guys how to you set the home plate so the nozzle dont hit the glass? I saw other kits have stepper additions for the back, but is there a way to reset where the plate goes in the program itself? If so to what hight. I bought the glass part from flashforge direct as I had credit there

Thank you

You need a shim to raise the Z axis endstop position, like this one: http://www.thingiverse.com/thing:1886458 (if you have an older version of the FFCP and this model doesn't fit, try one of the original designs this one was remixed from).

Z-Axis shim spacer for 2016 FlashForge Creator Pro (for glass bed, customizable)
by DrLex

Thank you for the reply! this is the glass I have, can't seem to find a file for the same size?


I have just added a 6 mm version which is about the same thickness as those plates.

Hi sorry to bother again, but was wondering if you had to change any settings in heat etc when adding the glass plate? and if so does it matter what thickness?

Seems stuff is sticking alot less printing with ABS and using gluestick as people indicated

The thicker the glass, the more it will isolate the heat. I'm afraid 1/4 inch (±6 mm) may be too thick. Glass is not a good thermal conductor. With a 3 mm plate, I already lose about 15°C on the surface when heating the bed to 110°C, but 95°C is still OK to get good adhesion with hairspray.
You can try a few things:

  • Try hairspray/3DLac instead of glue stick. Make sure to clean the glass well before applying it.
  • Increase the bed temperature. However, if you use printed brackets to clamp the glass, and heat the bed far above 110°C, the brackets could start deforming rapidly.
  • Seal your enclosure as much as possible, for instance use this plug for the door (or tape if you don't have any flexible filament to print this), and this insert to reduce the gap in the hood. Also, do not enable the fan unless necessary.
  • Find thinner glass.
Flashforge Creator Pro 2016 Door Handle Draft/Warp Stopper
FlashForge Creator Pro hood insert 2.0
by DrLex

You are the best! thank you so much

I have a glass 220x220.
What items I need printer?

These clips are only suitable for glass plates that aren't larger or smaller than the printing bed by more than about 1 cm. If you have a Creator Pro and want to use your 220x220 plates with it, then these clips are of no use. Otherwise, if you have a printer with a bed of approximately 220x220 and screws on the corners, then just follow the instructions in the Thing Details.

" If you have a Creator Pro, then these clips are of no use."

Huh? Why? The headline for the part is 'Customizable Adjustable Glass Bed Bracket for FlashForge Creator Pro etc'

The brackets I have now for my 6.3mm glass plate are pretty unsatisfactory so I was going to give these a try until I read this comment.

You should read things in context: that was a reply to someone who said he has glass plates of 220x220mm. These brackets are for plates roughly the same size as the 230x155mm FFCP bed. 220x220 is way too different, therefore for this person these brackets are of no use (I updated the reply to avoid further confusion). The difference between bed and glass plate should not be larger than about 10 mm in either dimension to use these brackets.

Ah, sorry -- I did miss the context. Now these are my next-up project to print!

I'm having trouble with the nuts slipping on the pins. Printing in PETG, most of my other prints are pretty accurate in terms of dimensions (nut holes etc are spot on). Any tips?

Coarser thread versions of the nuts and pins are now available (I used the same ones as Lochemage's remix).

I wouldn't recommend PETG if you're going to heat the bed above 75°C. If that's not the case, then print at the lowest temperature that produces a strong result, and provide ample cooling during printing to prevent details from melting into each other. You could try to print the pins in upright position as well, but that will require a good raft.
Somewhere in the coming weeks I'll try to add an alternative set of pins and nuts with coarser threads that are easier to print.

Thanks that would be helpful. For now I printed the bolts scaled down to 96% which seems to have done the job. Regards temps the PETG doesn't melt until around 180'C and I rarely go above 80'c on the heat-bed so I'll give it a go and see how they stand up.

Ayyyy I wanted to say thank you. The plate holder is the only thing I still argue with on the FFC so I'll slap these in next week and see how it is.

Will not hold the glass properly against the base plate ! it will lift it as you tighten the screw.
Here is one that does: In fact,

Glass Holder for prusai3 or similar 3D printers
by Forc3D

If the brackets are printed with a correct bed size such that they have no vertical play, and the nuts are not over-tightened, then the plate won't lift. The screws should only be tightened just to the point where the plate can no longer move, otherwise the tension in the plastic will cause it to deform from the heat anyway.
Any design that clamps down the plate from above will need to have stuff sticking out above the plate, with a risk that the nozzles will crash into it.

Not at all, it will lift the glass plate because the part will give ! Others here have made similar holder, I told them and after having measured with shims, they saw the problem.
You should use a slanted contact surface against the glass edge that will force down the glass.
Anyway spring steel is better for this usage..
For example a U shape pinching the glass plate and base made out of steel shim or spring wire is more secure, the printed surface lost is minimal if one make it thin enough.

If this is such an obvious problem, I would have expected it to be reported in the comments of the two original Things of which this is a remix, which exist for almost a year now. I find none, only things like “works great”.

This remix has a more central position for the screw and nut with respect to the bracket than the original designs. This makes it even less likely that it will start to tilt upwards. Moreover, my instructions clearly state not to tighten the screws any more than is required to secure the plate. If anyone wants to turn the knobs until everything starts to bulge, then it is user error.

I have already done a 3-hour ABS print at 110°C with these brackets, and the plate didn't move in any direction. The only caveat is that the bed has a much larger thermal expansion than borosilicate glass, therefore it is important to preheat first and check that everything is tight before starting the print. Bed levelling should be done with the bed preheated — this is true even without a glass plate as I have learnt from months of working with BuildTak. I even did the test of preheating to 110°C, tightening the nuts, and then letting it cool back down all the way to 15°C, which is about the worst case of additional stress imposed on the brackets due to thermal contraction. Nothing happened, nothing lifted.

I don't care about a few mm of lost space due to a clip on the glass, I just don't want to constantly remind myself that there are things sticking out above the build surface and I might crash into them if I would modify my pre-print or bed levelling procedures.

Anyway, I have added an option to the customizer to extend the model with an extra ridge at the top edge of the tabs, that could offer some extra downwards clamping force, especially if the glass plate has rounded edges.

"Anyway, I have added an option to the customizer to extend the model with an extra ridge at the top edge of the tabs, that could offer some extra downwards clamping force, especially if the glass plate has rounded edges."

OK, as you do what I suggested.

Just noticed this guy proposed the same thing as you but earlier.

Flashforge Creator Pro Glass Adjustable Bed Bracket with bolt action and duplo threads

“Just noticed this guy proposed the same thing as you but earlier.”

Good stuff Doc! Hopefully this works on my PowerSpec Ultra, I think it has the same bed size.