Zonestar Z8XM2 X-Axis Belt Tensioner

thingiverse

After searching for a x-axis belt tensioner, I found that none fit my Zonestar Z8XM2 perfectly. However, I discovered the [CR-10 X-Axis Realigned Tensioner](https://www.thingiverse.com/thing:2417659), which worked after some sanding. That's where the knob came from, thank you! I used that model as inspiration and designed a new belt tensioner from scratch using Fusion 360. The Fusion 360 model is included if you want to make changes. To assemble this tensioner, you'll need an M5 hex head bolt about 25 or 30mm long, and a standard M5 nut for the knob and puller. A nylon lock nut won't be necessary here; using one may even break things. I added a washer between the cap and knob, but it's not really needed. I used an extra M5 pan head bolt, about 20mm or so from the printer's kit, along with an M5 nylon lock nut to mount the bearing in the puller with the nut facing outwards. The bolt's head needs to be no deeper than 3mm to avoid hitting the printer as it slides. This tensioner uses the standard bearing that came with the printer. The bent tensioner stays in place due to belt tension, requiring no screws or other fasteners. It has been very sturdy for me and hasn't moved or loosened at all. This modification made a huge difference in my prints. My circles were never round before installing this. I also used the [Adjustable GT2 belt tensioner](https://www.thingiverse.com/thing:1071695) for my Y-Axis, which works well enough, but I'll eventually design a tensioner with an adjustable knob like this one. If this helps you, feel free to leave a tip!