I purchased some cheap 8mm shafting from China and it all turned up bent so I came up with a simple but accurate way to straighten them quickly with low budget tools. I used a DTI (dial test indicator) and some skateboard wheels and bearings.
Results were as good as plus and minus 5 microns. The worst case was plus and minus 10 microns. Way good enough for a 3D printer
Post time: Jun-22-2017