Dual Z-axis Belt Tensioner for Synchronizer (Anet E12)

thingiverse

This is a belt tensioner designed for use with the Anet E12 and the Z-axis rod bearing support brackets I previously created. The goal was to design a more compact unit that would be easy to print and wouldn't waste too much filament. This will fit on any 2020/2040 based printer, but make sure you raise your Z-axis all the way up before tightening things down so it won't bind on the way up. Things you'll need: 1x 760mm GT2 Belt - A 750mm belt should fit just fine, but I haven't tested this yet. 2x GT2 Toothless Pulley 5mm Inner Bore 2x M5x20 Screws - There's room for any head type of M5 screw. 1x M5x40 Bolt- If your belt is very short, you may need a slightly longer screw. 1x M5 Nut 2x M4x12 Screws 2x M4 T-Nuts 2x Z-Axis Rod Supports - https://www.thingiverse.com/thing:3377129 Step 1: Install the idler pulley in the main body with an M5x20 screw. There's room for a nut on the bottom if you want, but my M5 threaded right into the plastic securely and gravity is only going to help it stay put. Step 2: Install the M5x40 bolt into the carriage. Step 3: Wrap the belt around the second pulley, teeth facing in, and install the pulley into the carriage with an M5x20 screw. Again, there's space for a nut if you want, but I don't believe it will be necessary. Step 4: Install your M4x12 screws into the main body and put the T-Nuts on the back side and install it onto your printer. The position shouldn't make much difference, but I have mine very close to the right Z-axis pulley so it's as out of the way as possible. Credit for the knob goes to skartz as I didn't feel the need to reinvent the wheel... or a knob. https://www.thingiverse.com/thing:2562946