alternative Prusa refitting set, variable size

by Petehagoras, published

alternative Prusa refitting set, variable size by Petehagoras Nov 13, 2012


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What this Set of parts is for:

  • easier size-modulation for 3D Printers
  • Alternative Structure Materials of the frame
  • Adjustable printer and bed levelling, to make it work on every surface, no matter if its perfectly leveled


As you can see, i used aluminum beams for it, but everything else should work, if it provides enough strength. I already thougt about unsing wood, with some further reinforcements, but nothing tested yet.

the z motor mounts can be placed inwards, so that the thickness of the vertical beams isnt an issue for the x-axis, but then be shure that there is enough space to the printbed for the z-stabler. This modification could also have an effect on your available z-height.

the x-axis is all from prusa, thats why i marked it as derivate from it. I did this because i had trouble constructing a reliable x-axis, and my prusa parts worked nearly perfect. So you can use yours, or choose whichever are marked as prusa compatible. for extended x-range i'd recommend 10mm rods.

same for the z-couplings, i used mine, findable within my things

To change the size, just shorten or lengthen the beams, rods an belts. All the other parts will work fine on it.

If you change the thickness of the beams, be shure to mount the y-axis parts at the upper edge, to ensure the bed going above the beams.

If some people are interested i can give a complete hardware parts list, and some formulas to calculate the needed rod an beam lenghts for a desired printable size. (these informations would take a bit of time, of which im actually short of)

Feel free to modify, derivate or whatever, there's plenty of space for improvement in these parts. If .skp files are needed, let me know, i can up them aswell.

skp files from all parts and the printer to see where the parts belong.

one more thing:

as y axis bearings you can use what you prefer, i used prusa ones

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Where the God of Love is the project that I3 with this frame metal rail?

Hi, sorry I totally gave up on this project. In my opinion this design is much to unstable for accurate printing. The portal shape swings like hell when printing a bit faster. A solution could be to make an A-like shape, but that would pretty much look like a regular prusa design. I prefer Delta-Designs nowadays.

Looks nice. Can those Z motors mount be used on the bottom instead to lower the center of gravity? Nice job!

how much did the metal cost?

the aluminum open beams, 20x20mm cost about 20€

I've been over to Misumi looking at the aluminum extrusion. I could do it in wood but the adjust ability with the slots/nuts combination is enticing. Only 7 pieces at 300mm, so not too expensive compared to a kg of plastic. 

So do you have a BOM? I started to add stuff to their cart and realized I had know idea what lengths/diameters for nuts and bolts etc.

I'd appreciate your help. Hate to buy twice.

Damn...i've overseen your comment, sorry for that. Therese an upcoming version 2, with larger build area, propably 200x200x200 with same aluminum pieces, and shure a BOM.. .Sorry again for the damn late reply

skp file would be nice. Is it the complete build with all the parts where they're supposed to be in the assembly?

 .spk are up ;-)

One part is absent. The triangle shaped corner bracket x 10. I drew my own but I'd have to make a derivative to post it. If you want it, I can do that. 

mine are not printed ones, but standard available parts for the aluminum beams. You can handle the uploading/files as you prefer, thx for the info.

Yeah. I looked more closely after posting and saw those. I was thinking about using wood and would need them anyway. Not till the first of the year though. thanks for the model and skp files.