I designed these new linear bearings for when I assemble my new steel prusa. I didn't want to wait for IGUS bearings so I never bothered with those. The benefit of these bearings over the usual ball bearings is that they can be made at home, weigh a lot less than the usual alu bearing blocks, are quieter and can be readjusted many times as the PTFE liners wear.
Insert three 4 mm diameter and <25 mm length pieces of PTFE tubing (six pieces of <15 mm length for the long bearings) into the inside of the bearing, slide it onto the shaft and insert an M4 grub screw (or regular M4 screw) in the single hole in the middle to adjust the tightness of the bearing. It will need to be adjusted after bedding in as well.
Use 4 M4 screws to attach the bearings, just like the usual bearing blocks. PTFE-bearing02 has slots for regular M4 nuts (nyloc nuts are too hard to turn and will break the blocks unless they are threaded before installing). The mounting dimensions are the same. The bearings will bind if they are moved on the rod alone without mounting them to a rigid surface. because they are easily teetered by hand. When two bearings are sliding together with a frame they should glide smoothly.
I might uplaod more variations which orient the PTFE liners differently later on for load optimizations in different applications.
PTFE-bearing01 has integrated threads in the mounting holes.
PTFE-bearing01-nut has hex slots for inserting M4 nuts for the mounting holes.
PTFE-bearing02 has integrated threads in the mounting holes, and teflon linings rotated 90°.
PTFE-bearing02-nut has hex slots for inserting M4 nuts for the mounting holes, and teflon linings rotated 90°.
PTFE-bearing03 is externally shaped exactly like the normal bearing blocks, and has integrated threads.
PTFE-bearing03-nut is externally shaped exactly like the normal bearing blocks, and has hex slots for inserting M4 nuts for the mounting holes.
PTFE-bearing04 is long version, and has integrated threads in the mounting holes.
PTFE-bearing04-nut is long version, and has hex slots for inserting M4 nuts for the mounting holes.
0,4 nozzles and 0,2 wirks fine. Three perimeters and zero infill works. Add more if you like.
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