Belt Centering
Center the belt and balance front tension
Keep all 4 corners between 20 mm and 40 mm before hardware calibration.
Open safe access
Remove access parts only if needed. Bring a ruler or caliper, a pencil, and an IPA cloth.
Measure before touching the hardware
Take all 4 readings before you adjust anything.
Loosen the front tension
Loosen both front screws about 4 turns. If the belt stays tight, add 1 or 2 more turns.
Slide the belt in the direction shown by the calculator
Slide the belt left or right while rolling it by hand. Use a pencil under the edge if it sticks.
Run the Roll test and rebalance the front roller
Re-tighten both front screws evenly, run the Roll test, and check for drift or scraping.

Use the Roll test between centering corrections so you do not assume the path is stable when it is not. Re-measure and repeat
Update the calculator after each pass. Keep all 4 values between 20 mm and 40 mm, with no more than 10 mm left-right difference at the front or rear.
Before you finish
- All 4 corners are inside 30 mm +/- 10 mm.
- The front left-right difference is at or below 10 mm.
- The rear left-right difference is at or below 10 mm.
- Front roller tension feels equal left and right after the Roll test.