Chapter 2. Troubleshooting

There's a grinding noise while moving back and forth. What's going on?

Version 3

This usually means that belts are too loose, most likely during shipping vibrations affected them. Locate the idler pulley on the opposite side of the motor holding the belt; the pulley is held by an hex screw. Do not try to loose or tight it, but simply tap it with the hammer on the opposite direction of the motor.

You only need to move it by few milliliters, tightening the belt. After that, you're ready to go.

Version 4

When it initially calibrates, does it correctly work? Does it reach the end without problems or it stops mid-way, thinking it reached the end?

If it calibrates correctly, but the problem shows only after a while, it might be the central tube being a little out of square. First of all, I'd suggest you to manually try to reset the position of the central pipe: raise the head and manually pull the central tube towards you, until both ends of the tube are in contact with the metal angles of the left and right sides. Gently apply some force to make it move to the correct position.

If you still have issues, you can try to remove the screws from the left and right ends of the central tube. If you take a look at them, you'll see that there are 2 screws that are sticking out from the metal part, and 2 of them that are flush with the metal; remove the flush ones (see below).

In this way the central bar is free to move a little, compensating any imprecision in movements.