Greg's Hinged Accessible Extruder

by GregFrost, published

Greg's Hinged Accessible Extruder by GregFrost May 4, 2011


This is an update to my Accessible Wade's Extruder.

The idler is now hinged using an M3 screw.
I have also added support for the central part of the 608 idler so that there is no need to use washers to space the bearing away from the plastic.

I have been using this design for a while now and love it.

Changing filament is a simple as compressing the spring then whipping out the old filament and poking the new one in.

UPDATE: 6 Aug 2011 - Add arcol (cory75 thing:10532) and wildseyed hotend mount options. Im not overly happy with the asymmetry of the arcol option.

Recent Comments

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Where do I find the GHAE that has the fan mount holes in the base?

Is there a source for all those variables? For example jhead_mount=256. What does this mean? Some reference would be greatly appreciated! Thank you!

This is a great design, and will be replacing the stock "Steve's Extruder" on my Rostock as soon as I get the hardware together. My only gripe with this Thing is the amount of searching I had to do to find the hardware list necessary to assemble this. You'd think that'd be easier to find, considering that you can't build one without that information.

Do you think you could include a list of required hardware in the Thing Info, just for the sake of having that info in one easy-to-find location?

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Greg's Hinged Accessible Extruder by GregFrost is licensed under the GNU - GPL license.

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The hotend mounting configuration can be selected in the openscad file.

simply call the wade module like this (which is how the included stl was made):


If two mounts have compatible holes, you can include the holes for both like this:


Once it is printed, you will need to trim off the little support piece for the idler hinge and drill the support membranes from the hobbed bolt hole and motor mount holes.


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AbuMaia on Apr 20, 2014 said:

Where do I find the GHAE that has the fan mount holes in the base?

core_security on Feb 1, 2014 said:

Is there a source for all those variables? For example jhead_mount=256. What does this mean? Some reference would be greatly appreciated! Thank you!

FullMetalBoxers on Nov 29, 2013 said:

This is a great design, and will be replacing the stock "Steve's Extruder" on my Rostock as soon as I get the hardware together. My only gripe with this Thing is the amount of searching I had to do to find the hardware list necessary to assemble this. You'd think that'd be easier to find, considering that you can't build one without that information.

Do you think you could include a list of required hardware in the Thing Info, just for the sake of having that info in one easy-to-find location?

jkeegan on Jul 15, 2013 said:

I'd never noticed this but there's an error in the scad. I've rendered many Greg's accessible extruders and was always irritated that the holes for the motor still had to be drilled through, and the hole in the center where the hobbed bolt goes needed to be awkwardly drilled through the bearings.

Yeah. That's because there are references to a variable called "layer_height" that doesn't exist.

There is a "layer_thickness" variable set to 0.4, but no layer_height. I set it to 0.4 as well, and sure enough, the motor holes now go pretty much all the way through and the hole in the center where the hobbed bolt goes is there.

Rather than upload a derivative that fixes this, I figured I should post that here on the original part. Maybe Greg can upload a v4 within this thing id (I know 8252 by heart) to fix this problem.


shiggity on Jul 11, 2013 said:

I'm using the MakerFarm version of this. What I noticed is as the motor tries to extrude, the large gear turns, turning its inset nut with it. This of course turns it clockwise along its axis, toward the extruder side, subtly tightening the hobbed bolt against its washer/bearing on the other side. The hobbed bolt eventually gets shoved up against the washer/bearing so tightly that the motor can't extrude. Is there any workaround for this? Has anyone experienced this?

GregFrost on Jul 11, 2013 said:

Lock a second nut against the first to prevent if from tightening itself.

KreAture on May 5, 2013 said:

On the idler...
By removing the +2 and +1's on the corner boxes to form the rounded corners but keeping the actual code for rounded corners, the part renders and exports cleanly.
The odd issue ppl have been having with those towers and wrong slicing seems to be caused by the expansion of the part you cut with vs the target. Why would this work? Just made the cutting part same height and sims as the part to cut and problem gone?

Ohmarinus on Apr 14, 2013 said:

Why is the hole closed for the hobbed bolt? When I print this it goes weird, just like the older version. The older version doesn't even leave enough space for a bearing on the gear-side of the extruder.

I am trying to print the one with the extra holes in the bottom.

i-make-robots on Apr 12, 2013 said:

Hi! I'm trying to use the large & small gear in an unrelated project. Please: What's the ideal distance between the gear centers? I don't know the right way to measure it myself.

kru96 on Feb 26, 2013 said:

sorry, where is the configuration.scad file?

GregFrost on Feb 27, 2013 said:

Get this http://www.thingiverse.com/thi... and get the source from my github

kru96 on Feb 26, 2013 said:

Which motor uses this extruder? Is it a NEMA 17?

GregFrost on Feb 27, 2013 said:


ThePlanetMike on Jan 22, 2013 said:

I created a stylish arched mount adapter so that this extruder can easily be installed on a Thing-O-Matic using the holes already there. Check it out: http://www.thingiverse.com/thi...

thab2knoe on Jan 15, 2013 said:

Any way to get the solidworks files for the gregs wade extruder (most recently updated) and the herringbone gears small and large? Need to do a few edits and hoping to be able to access them in solidworks. Thanks. Please email them to me if possible at [email protected]

AtomSoft on May 19, 2012 said:

What program can i open this with to get actual dimensions. Or can you post that data?

cobra18t on Apr 16, 2012 said:

Any idea why Skeinforge would forget to print an infill on the central part of the large gear hub? I am trying to print parts for my MendelMax on a friends Cupcake without changing his toolchain.

GregFrost on Feb 27, 2013 said:

Could be their layer height is too high for the model. If you compile the latest scad from my GitHub you can choose the layer height.

tlalexander on Mar 14, 2012 said:

Why do M3 nuts not at all fit into the slots at the top of this? Is it not designed for M3? Or is that a bug? They're super hard to open up with an x-acto, and I cracked one side forcing a nut in (with a hammer - after trying to open it up with an x-acto). Perhaps its because I used PLA, which may be harder? Anyway I'm mounting this to a bowden tube so PLA is fine for me.

Also, as someone pointed out, this references both layer_height and layer_thickness variables, but only one is defined. It will not build properly unless you add
layer_height=layer_thickness (or vise-versa, whichever one is defined, I forget).

4ndy on Jun 29, 2012 said:

After trying to adjust it with a tiny multitool-chisel and ending up having the nuts too loose, I eventually cut the slots on mine out to fit M4 nuts
amp; bolts.

epochapex on Mar 21, 2012 said:

I am having the same problem. So frustrating!

Why release something with nuts traps that are too small? :'(

QuantumConcepts on Feb 6, 2012 said:

Trying to slice this up in Slic3r and the result, when loaded in Pronterface, is very strange. Slic3r told me that "the model has overlapping or self-intersecting facets," and that it tried a repair. I started the print just for kicks and it is clearly not right!

GregFrost on Feb 7, 2012 said:

slic3r is pretty picky about its stls. run them through netfabb cloud first. but really you should be printing this: http://www.thingiverse.com/thi...

wigwagdevblog on Feb 1, 2012 said:

I can't get the idler to slice and print right? I printed the v6 perfectly but the idler only prints two separate small towers.

armageddon421 on Feb 2, 2012 said:

I am having the same problem. There are some strange looking things on the idler when I press F5. They are gone when I press F6, though. Slic3r reports intersecting faces and slices the model into two seperate small towers.

toehead on Jan 31, 2012 said:

I'm having a hard time getting this to compile correctly. I have placed it in the folder and all dependencies are met (no errors either). However, the final geometry is created with the hole for the hobbed bolt completely missing. Can somebody send me an STL compiled for the groovemount option?

nathan7 on Feb 13, 2012 said:

There's a membrane there, yes. It would never bridge correctly without. Stab it with a screwdriver or drill it out.

Anonymous on Jan 18, 2012 said:

Where does one find the configuration.scad and inc/parametric_involute_gearV5.0.scad files #included in the .scad files?

Anonymous on Jan 18, 2012 said:

Answering my own question: These SCAD files should be put in a https://github.com/prusajr/Pru... directory.

JamesRPatrick on Jan 8, 2012 said:

I like the upgrade from the original Wade Extruder, but I have one suggestion. This extruder was designed before breakaway support material was routinely used, and the supports designed into this version seem inadequate(undersides can peel away). I would suggest providing a version with no support so that users can add their own.

tlalexander on Mar 14, 2012 said:

I agree with Triffid. This would be a mess with breakway support. But it would be nice to offer a model free of that stuff - for example if someone has an SLS machine at work, or if they'd rather order one of these from Shapeways or something.

triffid_hunter on Jan 16, 2012 said:

fwiw, I personally prefer the gantry-style support in this to other types of automagically generated support

Anonymous on Dec 21, 2011 said:


Is there any chance you can post this in .step format (or any other native CAD)? I want to add slight modification so it can fit my Z-axis mount which is other than standard.

ThePelton on Dec 11, 2011 said:

Someone should make a library of about a hundred different gears that would all work together.

Anonymous on Dec 4, 2011 said:

Looks good. Is There a full tutorial for this extruder somewhere? I'm new to this 3D printing so unsure what hotend to fit on this.

Chorca on Dec 27, 2011 said:

This extruder is almost identical in build to all the other Wade's variations, including the original Wade's. It uses the same hardware, aside from dropping 2-3 bolts for the filament holder and fitting a bolt into the bottom to act as a hinge.

Other than that, searches for how to hob the bolt for a normal Wade's will work just fine.

As for hotends, check the .scad file with OpenSCAD (look up some tutorials for some basics on how to use it) and set it to the hotend you want to use it with, it will then generate the proper file for that hotend.

michaelc on Nov 20, 2011 said:

Could someone possibly modify the wildseyed for a 16mm barrel rather than 13mm? I would really appreciate it. thanks

pelrun on Nov 10, 2011 said:

Found a small bug in gregs-wade-v3.scad - there are references to both layer_height and layer_thickness in the code, but only the latter is defined. My extruder body came out missing most of the through-holes!

I'm using the felt-branch configuration.scad, so it may be that layer_height was defined in the old one and not in this one.

ECsuyu on Sep 17, 2011 said:

great design, totally unfamiliar with openSCAD, installed it, looked at it, and after 30mins was still as confused as I was when I started. Can anyone generate an STL for the ideler for the mendel V6 but instead has a 16mm PTFE groove instead of a 12mm one.

michaelc on Nov 22, 2011 said:

Hi, would anyone be able to upload a 16mm version?

gcolbourn on Nov 10, 2011 said:

Could you upload the stl for this? Also, I was wondering - how do you affix the extruder? Surely wedging it in the hole is not enough to stop it falling out under pressure from the plastic being pushed in downward. In the original Wade design, there were 2 small screw holes at the side.

armyofevilrobots on Sep 29, 2011 said:

Ping me on the FV reprap forum group to remind me. I'll build one this weekend for ya.

Henque19 on Sep 13, 2011 said:

What vitamins are needed for this extruder? Is it possible to get a BOM for it? Thanks!

mattgilbertnet on Feb 20, 2013 said:

I would also like a BOM.

DaveJones on Sep 8, 2011 said:

Great looking design. I'd like to try this but am unable to use openscad (my PC is and old fart, like me). Could someone possibly generate an stl for a makergear groove mount hotend?

NBitWonder on Aug 4, 2011 said:

Question: Could the filament guide for this extruder developed elsewhere on this site by Ben Jackson be integrated into this build package? Might make an already very good looking extruder even better :-)


GregFrost on Aug 6, 2011 said:

I like having access to the hobbing so that I can see if there has been a filament strip. With a properly managed spool, you shouldnt have a problem.

ccotter247 on Jul 29, 2011 said:

Hey could you please upload the stl's for the makergear hotend. AS i am a total openscad noob. My computer can't even run the config. installer package so i cannot do the export and changes myself. :(

C.Cotter 24/7

chrille on Jul 27, 2011 said:

Nice and clever design! Does anybody know if an arcol hot-end mounted on this will fit inside the lm8uu X-carriage?

GregFrost on Jul 29, 2011 said:

I dont think it will.

Anonymous on Jul 26, 2011 said:

if you're intending to print 1.75 filament, don't forget to change the 'filament_diameter' to 1.75. I made the filament feed hole 2.0, but that was too small and I had to widen it so it would feed properly. You might be best leaving that at the default value.

GregFrost on Jul 26, 2011 said:

reaming the filament hole is probably a good option anyway, so it is nice and smooth.

Anonymous on Jul 26, 2011 said:

The hole mounts for the groovemount are indeed off a little bit, at least for the groovemount I received from makergear of april 2011. The constants can be tweaked a bit to move the holes to the right place or you can just widen the holes to accommodate the misalignment. Greg, if you want to integrate this change, just remove my comment.

in the // mounting holes on the base section, I replaced the two hole translations with



and a few lines below it:




mattproc on Aug 21, 2011 said:

Thanks for this, mine fits after making these changes. The wooden groovemount holder from makergear (the wade one at least) is asymmetric.

I never built a regular wade's extruder so I'm not sure why that's the case.

Anonymous on Jul 20, 2011 said:

Are the two screws to hold in the hinge in beneficial or just one. I'm seeing photos both ways. If one are they equal? The bearing not quite perfectly parallel with just one, perhaps this is the cause of occasional filament misfeeds on my hobbed bolt.

mark on Jul 15, 2011 said:

Can this mount on a standard Sells X-Carriage? If not, which carriage would be a good upgrade?

GregFrost on Jul 16, 2011 said:

This extruder has the filament path directly in the middle of the two mounting holes. The sells/old wade does not. It is off by about 3.5mm in one direction and 1mm in the other. Depending on your hotend this may not matter. The mounting hole spacing is the same as Sells/Wade (i.e. 50mm).

I would recommend my lm8uu carriage.

RichRap on Jun 28, 2011 said:

This is the extruder evolved to near perfection, great job, it's working very well for me, thanks Greg.

I made a small change to the Idler by adding a built-in lever so you can pull it back to insert filament without undoing the sprung bolts, really handy :)

sxt173 on Jul 27, 2011 said:

Do you have the built-in lever on thingiverse? I would live to try it out.

watsdesign on Jun 17, 2011 said:

With the v6 I had some heat problems (comparing to the Adrian the mounting points are less strong)

But with a little sheet of aluminium and a fan it's ok :)


4ndy on Jun 19, 2011 said:

Wouldn't be such a problem if you weren't using PLA in extruder parts where it doesn't belong, but then you work with whatever you've got... so nice fix.

atntias on Jun 6, 2011 said:

the spacing on between the hole is wrong for the groovemount, i had to manually edit it in sketchup and move the holes. maby il upload my edit version. other then that i love the design using it!

Anonymous on Jun 10, 2011 said:

did you upload your version? you are right that the groovemount doesn't fit.

sliptonic on May 10, 2011 said:

This doesn't seem to work for me. I'm getting warnings in openscad about unknown variables like 'm4_nut_diameter' and 'm4_diameter' It also gives a warning about being unable to open configuration.scad.

It does eventually render but does not have the hinge section for the idler to connect to and shows a strange flaw on the base near the hole.

Very cool design though.

GregFrost on May 11, 2011 said:

you need configuration.h from the prusa git repository. (or my fork: https://github.com/GregFrost/P...

nicgravel on May 6, 2011 said:

Had to do some little adjustment because I use 6-32 screws instead of M3 but I like the design.

Happy to see a design that use only one screw to hold the filament.

Thanks for that one !

owais on May 4, 2011 said:

Great idea! I only have one screw in there anyways right now, but this is a perfect innovation for the problems relating to the extruder

3drapid_info on May 4, 2011 said:

Good work! ;)

3drapid_info on May 5, 2011 said:

The Idller looks like my Idller


ScribbleJ on May 4, 2011 said:

Great design. Dunno why Thingiverse isn't rendering my "I MADE IT" above. Many photos on my Flickr... here's one showing the hobbing I used:


CloudMaker on May 6, 2011 said:

I tried (countless hours) to get the previous version of Gregs Extruder running with this kind of hobbing, but was unable to prevent the filament from falling of the bearing, whereas in a classical Wade Extruder it works perfectly.

Did you manage to get this kind of hobbing to run work reliably in this version of the extruder?