Z Axis Support for Prusa Air

by viresx, published

Z Axis Support for Prusa Air by viresx Nov 17, 2012
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I've always had problem with Z-axis that plastic couplers were falling down from motors. I designed this supports to hold Z axis and now I don't need to worry about height of extruder nozzle, because it's always the same.


  1. Print two parts.
  2. Get two 608 bearings, 2 M8 bolts and six M8 nuts
  3. Mount it to your Prusa Air

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Hi, I'm trying to find Prusa Air modification to bring Z steppers to bottom that you mention in previous comments. Does anyone have link to it?

Hi, Unfortunatly I didn't have time to finish this modifications. I'm satisfied with current configuration and don't want to invest more on Prusa Air. However I will probably make stepper motors on bottom in my next printer ;)

Dang, my acrylic frame that I bought from a vendor doesn't have the gap on the side where it bolts to the frame!

I will try to modify it in sketchup, thanks for adding that file :)

I removed this supports and bought metal couplers on Z axis. I had some wobble with this :(

True, like I said in my other reaction also, I now have bought aluminum Z-couplings and will also be moving the steppers to the bottom like in the new Air Jordan design. Did you see it?

Wow, this Jordan modifications looks very nice. Thanks :)

Ah, so Thantik was right?

I have very bad stability in my threaded rods, but it's because my couplings are in very bad shape. I got them from this guy that completely didn't print them well.

Do you know any 'emergency' couplers I can print that are quite good? I can machine my own couplings later on if I want.

Yes - now I'm planning to move motors to bottom using this design, which should give the best results.
I've heard that these couplers are great if your rods aren't straight, but I didn't test it:

Universal joint / coupler 5/8

Cool, I just put a post in General on the reprap forum about moving the steppermotors to the bottom.

Is there already a design for doing that?

No, but I planned to design it specially for Prusa Air... However I don't have enough free time :(

Hi viresx,
Could you also upload the plastic feets that you have on your printer? Do they really help with the noise and vibrations.

They really help with noise if you don't have any tablecloth. They are made of ABS to make wider, round surface and rubber foot (like this: one http://electropark.pl/akcesoria-obudowy/51-nozka-gumowa-5901000051007.html)http://electropark.pl/akcesori.... I will upload it at weekend, becouse I have it on other PC.

Bad idea.  This will introduce Z wobble in your prints unless you've got the absolute straightest of rods (you don't)

With the flexible couplings he uses he does not have to worry. I also have those (in my Prusa Air) and there is no wobbling, as the coupling absorbs everything

If you look at his other prints, you'll notice this is not the case, and he has significant Z wobble: http://thingiverse-production.s3.amazonaws.com/renders/63/0b/66/9b/fc/IMG_0037_display_medium.jpghttp://thingiverse-production....

I'll mount new straight threaded shaft's next weekend :) Especially left one needs to be changed.

That's why I'm going to print new x-axis like in new Prusa. 
I don't know why all versions of x-axis designs use so many nuts - not-threaded rod should keep everything straight.
Threaded shaft should only hold correct height using 1 nut. 
I also have metal coupler on top to eliminate wobble and I can see it's not absolutely straight :D

This is great, i was just about to make something like this to try to minimize the wobble in the threaded shaft. Now I don't have to draw it myself.

As "thantik" said, it's not going to minimize the wobble, if you don't have flexible metal couplings. It's only useful to keep it on correct height - these metal couplings can break if they are stretched for long time.