BetaPrusa 3D printer kits

by Domonoky, published

BetaPrusa 3D printer kits by Domonoky Nov 15, 2012



BetaPrusa 3D printer kits by Domonoky is licensed under the GNU - GPL license.

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This are the complete digital files for our newly released BetaPrusa 3D printer kits.

The zip archive contains all plastic parts as openscad and exported stl models for our 3D printer kit.
It also contains a openscad file for the complete assembly down to every screw, washer and cable needed.
There are openscad files for all other parts like the RAMPS1.4 Elektronics, Optoendstops and all.
This was used to generate a very nice assembly guide. Which is attached here.

You can read more about this on our blog www.ifeelbeta.de

And if you want to buy it, you can find 3 different variants, starting at 499€ in our onlineshop at www.2printbeta.de


The assembly openscad file is very big. So be prepared to wait a long time for rendering (F5). Full rendering (F6) of the complete machine doesnt work.

If you want to recreate it, print all stl parts in the archive, buy the needed vitamins and have fun.

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Prusa Mendel == GNU GPL?

 Now the whole thing is awesome!

I don't understand why people are STILL making the mistake of overconstraining their Z rods.  This problem has been solved over and over and over again, yet people still do it.

For the love of everyone making this thing, get RID of the bottom 608 bearings, and use couplers that allow your threaded rod to sway freely, but still provide Z-only movement.  When you overconstrain your threaded rod like this design, ANY imperfection in the threaded rod will get translated into your print and you'll get the dreaded z-wobble.

My cupcake shows (almost) no z-wobble (see this http://thingiverse.com/image:117005thingiverse.com/image:117005 ) and everything is as constrained as possible. She has no smooth rods, the threaded ones are slightly bent and the bearings are far from "best quality".

In my humble opinion, the z-wobble issue has more to do with eccentricity than anything else.

Reduce to a minimum* the gaps between bracket, bearing and rod (I used kapton tape in bracket-bearing and PTFE tape in bearing-rod) and the wobble will be drastically reduced.

Lower right hand corner of the purple vane shows z wobble.

 :) I knew it...
look, believe it or not, the wobble you see is because of 1) bent threaded rods 2)the swing of my bearings, main reason btw 3) there is not smooth rods and 4) Is a close up picture shot with a macro (layer height here was 0.15) when I compare this wobble with many printers with smooth rods I'm pretty much satisfied of the quality.

The most important anti z wobble tuning option is the tension of the x-belt and thus the lateral pressure on the threaded rods. The more you tend it, the more z-wobble you get.

And don't tell me that the threaded rod only affects z-movement, because it should run on the smooth rods.
That's only theory!

By the way: A flexible shaft coupling doesn't change any z-wobble problem. It makes it even harder to perfect center it.

just my 2 cent