Up Mini 2 belt tensioner for X axis

thingiverse

WARNING: This will not work with Z height detection, it's too long for that. A new version is in the works, but as I don't use the Z height thing, it won't be today. One of my printers' X-axis idler broke, and from the internet, I see this has happened to others. My experience with support is "fix it yourself," so here's what you need: Need to have the pillar holding the old bearing break off completely or help it disappear. Add some long M3 screws and locking nuts - and print one before you need it. Put nuts in, put belt in, slide the bearing and gears through the 10mm hole on the thin side and seat it against the 9mm hole on the thick side. Thick side up to prevent bearing escape. The bearing should protrude a little on the bottom and ride in the groove. No idea how long it'll last, printed it in ABS, and made two spares. 20190401: An alternative design was added to recover more travel and try to constrain the two bearings better. The initial damage caused one of the bearings to slip off the idler shaft with the previous design. 20190612: A possible alternative solution is on Thingiverse at https://www.thingiverse.com/thing:3987766