This is an compact Y idler design for Tevo Tarantula with integrated belt tensioner. It is a more compact design than the stock idler, making the printer a bit shorter in the Y axis. Belt tensioner slide has 20mm of available tensioning movement.
Uses stock belt pulleys:
2 - M5
1 - M3
UPDATE 1: Adding Lid.stl again, failed to upload first time
UPDATE 2: Apparently added wrong version of Lid.stl in last update. Pushing out the correct version (Lid.stl only)
UPDATE 3: Added version for stock 9mm wide pulleys
UPDATE 4: Added version with 2cm offset for extra bed clearance if needed.