28BYJ-48 supports and pulleys
thingiverse
Here's something that can help make projects with the popular 28BYJ-48 stepper motor. Two supports are included, one for horizontal surfaces and another for vertical surfaces. To hold the other end of the belt, two ball bearing supports have been added, each with a long screw to adjust the belt tension. Five or six millimeter MT2 belts can be used. Thirty-tooth and fifteen-tooth pulleys also fit well with this motor. Tiny washers are needed, along with a piece of copper wire around the screw. The ball bearings measure five millimeters in internal diameter and ten millimeters in external diameter. Screws that hold the ball bearings are #10, one inch long, while the screw for adjusting belt tension is #6. Motors stay in place using small 1/8-inch screws if holes are threaded or self-tapping screws can be used instead.
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