I tried printing a couple versions of this one. Recommended settings. PLA plate (Not PEI as you want it to be smooth on the backside) and scale it to 95%. The square hole in the middle is to big so it will create alot of wiggleroom with 100% scale. Scale it down to 95 and its nice and tight. Add a drop of sillicone grease behind it on the controller to make it smooth. Thank you for your design. Its awesome.