William Optics Z103 AutoFocuser

Autofocus system designed to mount to the finder screw holes of the Z103 (maybe be compatible with other scopes too). optimised for 3d printing, no supports required.

Designed to be used with an Arduino nano and fit an A4998 driver, im running myFocuserPro2 firmware which works well with kstars/indi, but also has stand alone software available too.

Disclaimer, i wanted this to be as compact as possible, so fitting the arduino and driver in the compartment is DIFFICULT! but definitely doable.

cutouts for usb, hardwired power cable and temp sensor.

Uses a single m3 screw for tension adjustment

Hardware:
Arduino Nano
A4998 (or A4988) Driver board
280mm GT2 timing belt
Nema 11motor up to 60mm long

recommend PETG to withstand heat but also is a bit more flexible less chance of breaking the bracket when inserting motor carriage.

note: the teeth pitch on the fine adjuster is pretty close to a GT2 belt, but not perfect, there will be a small amount of position loss, although i found using a linear autofocus algorithm it wasnt an issue