Demonstration　is https://www.youtube.com/watch?v=5mS63TFjgbQ Added 6mm-14Gear.stl instead of 7mm-17Gear.stl. Polar Equatorial for Arduino UNO R3 System. Necessary parts: (ELEGOO Arduino UNO R3) x1 (ELEGOO 5 Sets 28BYJ-48 ULN2003 5V Stepper Motor + ULN2003 Driver Board for Arduino) x1 (uxcell 608-2RS Deep Groove Ball Bearing 8x22x7mm Double Sealed ABEC-3 Bearings) x5 (Fasmov Camera Hot Shoe Mount to 1/4"-20 Tripod Screw Adapter for Tripod Screw to Flash Hot Shoe) x1 (Camera Tripod) x1