AnyCubic i3 MEGA Y-Tensioner
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I've been looking for a Y-Belt tensioner for the AnyCubic i3 Mega for a long time so I finally designed my own.
The base mounts with two of the bolts for the Y-rods to avoid having to drill holes in the case to mount the base assembly. (the original M3x8 might work, but I used longer M3x12)
The idler pulley should be mountable with original bolt (M5x16) and nut but it is very close. M5x18 works better but is not a common length. M5x20 is just a little too long and scrapes the case. I plan to make another carrier without the indent for the bolt head to see if I can get a common bolt to fit perfect, but there have also been reports that the original bold has worked fine for some prints. I am actually using the original bolt and no nut, and it has been fine, but securing it with a nut would definitely be better.
The tension bolt should be an M5 hex head cap screw, with the head going inside the carriage and the nut in the knob. I used an M5x35, and previously recommended a 30mm instead, however 30mm is a bit tight if your belt is reasonably taught with the stock mount, so it's better to use with a 35 unless you mind the end of the bolt poking out the nut head in front of the printer.
The pulley carrier originated from https://www.thingiverse.com/thing:2482051 - "Anet E10: X belt tensioner by MrCrankyface". I have added the hole for the nut and enlarged the hole for the tensioner bolt to fit M5 instead of M4. When inserting the pulley, it is very tight,…
