Satoer, I have considered it, but they are too expensive unfortunately. Maybe I can someday make a Felix extreme precision version...
Stratogavster, thanks for the link. I've ordered some samples from them.
Z shift? any proven solution??
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gfeliksdal
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Because the nut holder of Z-carriage is not tight fit it should not matter if the Z-screw is slightly bent. That is IF the linear bearing/slider of Z-axis has NO play in it. By removing all the play from Z-axis the screw can no longer wiggle the build platform back and forth. At least in theory... 
As said, I got rid of Z-wobble by changing the Z-screw, upgrading to bendy aluminum coupler (from eBay, similar to this: http://www.finelineautomation.com/syste ... upler1.jpg) and removing most (if not all) play from Z-axis slider carriage.
As said, I got rid of Z-wobble by changing the Z-screw, upgrading to bendy aluminum coupler (from eBay, similar to this: http://www.finelineautomation.com/syste ... upler1.jpg) and removing most (if not all) play from Z-axis slider carriage.