Stepper Motor Powered Ball Chain Pulley

thingiverse

This is my first project printing and making gears in blender. This is just a prototype. There is plenty of room for improvement, this is just what I could make quickly with little experience making these types of things. I believe the ratio is near 32:1, which makes the blinds go up slow, but due to the cheap stepper motors I preferred it slow and quiet. I do intend on making a faster version. My blinds are really heavy and this does the job. My steppers are powered by a A4988 stepper driver and Raspberry Pi Zero. I have my Pi zero run python scripts at certain times of the day. There is a flap that goes over the stepper, it is too thin and weak but it works fine if it comes off. I will get to that soon hopefully. The hardware I used were m6 bolts, nuts and washers. and standard 608 bearings. I did print spacers to keep the bearings straight which are not included. I do believe the only part that needs supports is the mount. Thanks to ( https://www.thingiverse.com/thing:2075662 ) for the pulley gear which had the best grip. I had to modify and combine a gear to this pulley. Also, Thanks to ( https://www.thingiverse.com/thing:567403 ) the Nema 17 mount, which is <b>not included in any of my files.</b> the stepper is quieter than the video after changing it to 1/8 steps https://youtube.com/shorts/3vPx_4RlS-c?feature=share