Tevo tarantula PRO X axis belt tensioner

thingiverse

These parts are designed to replace the original X belt pulley holder. The original bearings and bolt will be reused in the carriage. To assemble the carriage, you'll need an additional 4mm hex head bolt - any one will do as long as it's pressed into place. You'll also require a 4mm bolt and T-nut to secure the main frame to the X axis, along with a standard 4mm nut for tightening the belt (all these parts can be found in the gift screw package). For improved grip and tensioning by hand, you may print any 4mm nut knob from Thingiverse. If you prefer using 5mm bolts, simply swap out the carriage from the original design - they're interchangeable - and drill out the holes.