Zonestar Z8XM2 Y-Axis Belt Tensioner
Description
The Zonestar Z8XM2 y-axis does not have a belt tensioner, it's simply however tight you pull the belt while assembling. This worked ok for the first while, but once the belt had stretched, it was time to make a real tensioner. I had looked around a while at belt tensioners and was not able to find any that fit the Z8XM2. So, this is my creation. It's nothing fancy. It uses existing holes, no drilling required but you will have to partially disassemble your printer's frame. It uses 2x M5 screws and t-nuts to secure the tensioner frame to the printer and an M4 COUNTERSUNK machine screw to tension the belt. I had the screws laying around which is why the design uses them. I put a dab of glue to keep the M4 countersunk screw from spinning. The M5 screws are about 10mm in length, whatever fits but doesn't bottom out on the frame, and the M4 screw is about 25mm - 30mm or so. The M4 could be shorter. Basically you need to remove the existing belt tensioner and re-use the screws, bearing and washers. I don't recall if the washers were OEM or if I added them during the build. I built it as Large washer, small washer, bearing, small washer, large washer. That allows the bearing to move freely and the washers to be stationary. I also had some M5 screws and t-nuts laying around, so you'll probably need to source those as well. I also had to re-do the belt to the bed sub frame due to length. I just pinched the tensioner to the frame and tightened the slider's nut by hand. No fancy nut holder to tension it. I printed it in the standard cura draft profile. 0.2mm layer height, no supports, 15-20% infill, 2 shell walls, nothing fancy. Looking at the parts as they're installed, I printed the frame piece with the frame side down, the slider was printed top side down. Give it a go, it may fit other models. Modify it if needed. I included the Fusion 360 file for modification.
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