Chặn ốc chỉnh bed Ender

I got tired of bumping the bed screw knobs when accessing the tool drawer since I usually reach across from where I sit. Fits both stock ender and red bed screw knobs. Demo of oafishness https://streamable.com/poq5rq

0.2mm layer height. could try a single 0.4 but I don't think it will take much abuse. 
Should work with any hard filament.

Update: … ok in hindsight I should probably have glued these to the underside of the xbar. after pushing the limits of my printer with klipper it sounds like it's eating itself because of these caps. I'll try to refine them with a built in spacer to prevent/mitigate this. But to be fair, I haven't bumped my bed out of alignment.