Ball and socket feed tube anchor
Description
I designed this because I was having odd print failures which I concluded must be the filament feed. Turns out I was only partially correct, I had a sheared off idler shaft in the extruder. This part reduces filament friction in the feed tube. The extruder tube end is rigid while the ball end rotates and tumbles during printing. With a longer Teflon or PTFE tube, the end sticking out the ball can also behave like a fishing pole spring to help average filament feed tension from the spool rotation friction. The angle of the PTFE tube is constrained, about 40 degrees one way and 90 the other. The thread is 4-40 with countersink head. I did not have the correct length so I ground a long one shorter but forgot to measure the final length, (the length of countersink bolts is the top to tip and not the thread length). I very lightly sanded the ball but think it is overkill. The tube hole is 4 mm but I needed to run a drill through to clean up the hole for a nice snug tube fit. Designed in fusion 360 and printer on a cetus mk2 Have fun -Peter
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