This thing lets you easily adjust the tension of the X-belt, give great belt parallelism, and makes assembly/disassembly much easier than the two wobbly OEM bolts.
It comes in 2 parts:
- Main block (3 options)
- Sliding block
Choose from 3 options for the main block. They all hold the belt perfectly well. I would not make a decision based on their performance when printing. The difference is how easy the belt is to remove from each.
- Toothed - holds the belt to the main block using the GT2 tooth pattern. Extremely stable. Belt removal takes a lot of work.
- Looped - allows the belt to hold itself in place by overlapping its own teeth. Common design in other belt holders. I did a partial print to test this and it holds extremely well. Removal was easier than the toothed version, but still took a lot of work.
- Looped with plier port - this is an enhancement to the plain looped, which adds a small recess for the tips of needle nosed pliers to grab the belt for removal. Very convenient if you are tearing down your printer with any regularity for experimentation. Should permit much easier belt removal without any drawbacks.
- (2) M4 x 20mm socket head cap screws - to mount main block to printer
- (1) M3 x 25mm socket head cap screw - for sliding block
- (1) M3 nut - drop into nut slot on main block
If you want to modify it further, the source Tinkercad model can be found here:
Wanhao Duplicator i3 v2.1
I printed in PETG. Should work fine in PLA.
Print orientation of both parts has the belt recesses on top.
You'll need support "Normal" or "Everywhere" (not just "touching build-plate") in order to get support inside the cavern on the end that the tensioner block goes in. With Simplify3D, I can make the supports perfect. Choose 5mm support resolution to autogenerate. This keeps the M3 tunnel and hex slot empty of support. Lower than 5mm puts support in there, which is not optimal but hardly a big deal. I printed one with the tunnel full of support and worked it out cleanly with a small diameter allen wrench. The cutout on the rear of the main block (floor when printing) still has a bit of an overhang at 5mm resolution , but you can easily place additional support in S3D if you need it. PETG minorly benefitted from adding support all the way to the edge. PLA might not care.