85MM 28BYJ-48 Wheel

thingiverse

Because these smaller-than-usual stepper motors produce a lot of torque but struggle in terms of speed, making the wheels larger will help boost their little stepper robot's velocity! To create your small, lightweight robots quickly and inexpensively, I suggest printing them at .33mm thickness and 10% infill - accurate enough for them to grab onto cheap motors without any concerns.