Wobble arresters

We have really been having some problems with our not-straight threaded rods. So we decided to do something about it other than trying to straighten them.
We checked out some different possible alternatives. you can see them here, here and here.
We ended up designing our own wobble arester based on the fact that we have experienced a really low friction between PLA and Acrylic. We were also quite keen on not having to disassemble most of the printer. So this is what we ended up with:


The basic principle here is that we bypass the z-axis threaded rods and rely on theouter static precision rods. Hereby we only use the threaded rods to support the platform and move freely in the xy-plane.


The screws we had at our disposal were to long so we printed a quick-fix. They will be replaced at a later time.