I was inspired by this design from Fastferrari5555.
https://www.thingiverse.com/thing:2074514

I designed this mount that clips directly to the top of the blinds and connects to the hook without the rod.

This is designed to fit a 28BYJ-48 stepper motor.

Update 2020-11-01: After using this without issue for almost 6 months I decided to post the details of my Arduino project that controls this motor.

My electronics and program are available on GitHub.
https://github.com/nicklargent/automatic-blinds-controller

Anycubic

All-metal Mega

No

Yes

.3

10

Print 2 Arms.

Only the Bracket needs to be printed with supports.

I used 100% infill for the arms and 10% for everything else.

Assemble with 6 x 3mm screws.