07 - Run the Belts

Study the belt path.

Best practice is to run one belt before cutting. Use this belt to measure the other belt to the exact same length (by tooth count). Leave at least 1 inch (2-3cm) spare on one side so you can tighten by hand easily.

Start at the carriage. Set the belt flush to the edge and tighten the belt retainer.

Run the belts to the X/Y joints. The toothed side should run against the 20t pulleys. The smooth side should run against the flanged bearings.

Run one belt to the front idler/tensioner and back to the X/Y joint.

Continue running both belts to the rear.

One belt will engage the drive pulley.

Run both belts across the rear of the frame.

Run the other belt through the drive gear on the other corner.

Use paper clips or zip ties to help force the belt along the correct path as necessary.

Run the belts down the other side through the X/Y joint and front idler.

Finish the run at the carriage.

Double check that your belts both follow the correct path.

Ensure tensioners on both sides are completely loose.

If you cut both belts to the exact same length, pull both of them tight and ensure the same length extend beyond the X carriage.

Tuck spare belt back into the carriage.