suffering from z axis wobble?
This mod allows the Z axis screw to wobble without influencing the position of the nozzle. The Z axis nut is captured in a bracket that is not rigidly coupled to the X end brackets as with the regular Printrbot Plus.
This was created because I was having problems with z axis wobble. I saw some one using the Prusa Z Screw Isolator (thing:20147) and decided that there needed to be an equivalent for the printrbot plus. this may also work with the Printrbot LC however i have not been able to test this (if some one has an LC feedback would be apreciated))
Update: new stl file to fix one of the parts not slicing properly.
Update: new version with parts swapped so if you suffer from retraction issues they happen on the less important side of the print.
There are 2 parts, one for each side.
I printed at 0.2mm layer height, 0.4 infill, 2 perimeters with standard printrbot plus
my printer calibration is not perfect so I have added the sketch-up files encase any changes need to be made.
To fit them correctly lift the entire x axis off the top of the printrbot. drop the isolators over the z lead screw so that the nuts fit inside them and the flat side is on the top (note: the slot should be at the back facing towards the middle). lower the x axis back onto the z threaded rods. make sure that the wood which holds the z linear bearings fits into the slot so that the isolators cannot rotate freely.