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I am sure that someone on this forum aked for tips on printing rims but could locate thepost so i started a new thread.I have tried PLA,PET,ABS and nylon.Nylon is good but very difficult to remove supports.ABS provides the best finish but grub screws chew threads.PLA is not strong enough.These leave us with one choice PET.I managed the first 4 rims so far with 100% success.Data: -the axle hole in the rim has a dia of 2,58,because i cannot ,so far,control the elephant foot effect inside the hole -the grub screw holes have a dia of 2.34, i am using m2.5 grub screws ,with m2 thread was too fine. -i have created my own supports Pins are .2mm dia and stand .1 mm off the rim body. So my print consists of 5 parts:2 support rings,insert and spinner and rim Assembled \ To remove supports i put the print on top of a suitable tube and tap the center ,this removes the outer ring.Then squeeze the inner ring with a pair of pliers and cut it off