Prusa i3 Z-Axis support brackets

by Tech2C, published

Prusa i3 Z-Axis support brackets by Tech2C Nov 16, 2014
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The Prusa i3 frame isn't supported at the top, therefore it may oscillate or vibrate during a print.
So here is a set of brackets that will support the top of the Prusa i3 frame to the Y-Axis threaded rods.

Added 6mm versions for smaller threaded rod support of 5-6mm.


Print at 0.3mm with 30% infill.
The top bracket mounting holes line up with the existing holes for the z-axis linear rod support. You will need longer M3 screws to accommodate the extra thickness the bolt will have to travel through - 25mm length is good.
For the bottom bracket, you will need to install a longer length of 10mm threaded rod by an extra 200mm. This will allow 100mm extra to extended on either side of the frame that the bottom bracket can fix onto.
Finally you will need 8-10mm threaded rod with length of 350mm to connect the top and bottom brackets together. Tighten with nuts on either side of the brackets.

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This support brackets are better:

Prusa i3 Frame Brace
by eychu

Ironically enough I've basically made the same design on my own, though I complicated it massively by making the top part one piece with the other part in front holding the rods, and I made it hinged instead of a fixed angle: http://imgur.com/a/ZUFGI#0 (excuse the mess, old pictures) Though my design had a problem in that it didn't really help much until I added an additional set of y-corner parts at the ends of the extended rod bolted to the plastic part holding the diagonal brace (without the y corners there to touch the table the rod ends vibrated a bit), and zip-tied the diagonal brace rod to the frame near the top and near the bottom (one zip tie around the rod, one around the frame, one joining them, all very taught), I have theories that it's because 2x nearly parallel structures doesn't add much rigidity but a triangle does, does this design have a similar shortcoming? If not I wonder what differences in my design caused that problem, the hinges are screwed tight so they shouldn't functionally differ from your solid ones when tightened down, the brace rod feels pretty solid in there. If yours work better I'm tempted to print them, my rods should work fine with them, though I'm kinda tempted to ditch the threaded rods and laser cut frame and go t/v-slot 2020 extrusions, openbuilds and their resellers sell a kit of 12x 50cm v slot extrusions for €50~ with 90 degree brackets, t-slot nuts ahd the bolts for them included.

Well, let me start by saying that is 1 big wall of text!

Now I'm not sure what your question is? The photo's of your design should produce the same results as my design, that is to eliminate the top of the z-axis frame from oscillating during a print.

I plan at some stage to build a new printer, and I have seen those aluminium extrusions before which I think would be ideal. Although I'd have to check the local hardware store for a cheaper alternative, even steel would suffice. In fact a steel frame would be an ideal solid structure to house a moving x/y/z carriage and minimize vibrations.

Ah yeah sorry I tend to ramble, my design is similar to yours but it didn't seem to help much until I did this: http://i.imgur.com/GzlzcOH.png (please excuse the terrible photo) I added a y corner and zip ties, wondered if your design had the same problem or not.

Oh ok, I understand what you mean.
Well, first try slowing down your print speed. If that doesn't help, then try my bracket supports. Slowing down should definitely help though.

Comments deleted.

Hey Tech2C! I've been using your design for months now and I LOVE it! :)

Hey gadgetgreg! Glad you've been enjoying them. Thought I should post them here for others to use too.

It's a simple but effective design! I had to drill mine out to accommodate "standard"-sized rods because "standard" is more readily available and cheaper here in the US...

I really like this design but noticed that it is for m10 I have been using m8 rods. I would just modify the files myself but still unfamiliar with the best way to convert stl to a file I can modify, currently trying to use a combo of sketch up and meshlab to no avail, the sizes get totally messed up when I do the conversions, do you have any recommendations on good free programs?

The M8 rod will work fine with the larger holes as the nuts are wider than the M10 holes.
I just added an M6 version too.