If you have an original 4-bit Apple Scanner (and possibly the 8-bit and original Color OneScanner) that won't move the carriage, the large black plastic gear inside might have broken teeth. In my unit, this gear has become soft and sticky which makes it hard to turn on the spindle. This caused the meshing brass gear to shear off the teeth on the black gear.
I was able to model a new 3D printed gear that has brought my scanner back to working condition. The 144 teeth are extremely fine and I had doubts my FDM printer would work, but I tried a 0.2 nozzle and 0.1 layer height on a Bambu P1S and got reasonably good results.
The only issue I've noticed is it makes an oscillating sound now when the scanner moves at high speed. If I had to guess my printer didn't print the gear square?
Hope this helps you repair your scanner.
https://www.printables.com/model/1625890-apple-scanner-carriage-gear
I was able to model a new 3D printed gear that has brought my scanner back to working condition. The 144 teeth are extremely fine and I had doubts my FDM printer would work, but I tried a 0.2 nozzle and 0.1 layer height on a Bambu P1S and got reasonably good results.
The only issue I've noticed is it makes an oscillating sound now when the scanner moves at high speed. If I had to guess my printer didn't print the gear square?
Hope this helps you repair your scanner.
https://www.printables.com/model/1625890-apple-scanner-carriage-gear
