Roller blind direct drive with belt gear.

This is my self designed roller blind drive with NEMA17 stepper motor. There is belt drive with 1:2,5 ratio, and mechanism is mounted directly to the blind on opposite side to the manual drive. I suppose that your roller blinds are different but maybe in some part this project will be usable for you. 

Few details:

• big pulley is a parametric design of someone else - not mine
• small pulley is standard 20T GT2 with 5 mm axle - I got one so this wasn't printed,
• belt used for this is a closed loop one 6 mm width & 160 mm in lenght,
• blind driver: here you need to check if it is corresponding with your blinds drum,
• big pulled and driver are connected in my model by M3 bolt; in final version I applied also cyanoacrylate glue to join elements once forever :) - works perfect

Have fun! I am giving here also Fusion360 files so you can modify this as you want.

Electronics for this is under construction so project here will be updated with this in near future.