PID controllers are everywhere. They regulate temperature, motor speed, power supplies, positioning systems, process ...
Stepper motors are undeniably useful, but sometimes they need a bit of gearing to help perform their task. [Gjhudson2008] has a compact gearbox for NEMA 17 or 23 steppers that is mostly 3D printed.
Will Cogley on MSN
I built a 16 channel servo tester with Arduino and 3D printing
I Built A 16 Channel Servo Tester With Arduino And 3D Printing. A simple idea turned into one of my most useful DIY tools.
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