Very nice design. I made one too. It was hard to stray from your design. I did use the frame from Ikes cause I couldn't find a better one. I increased the width of the first two gears from 6mm to 8mm cause I was worried they would slip off. I also changed the buttons to slimmer and wider design. For the gear stands I used pop-rivets. For the motor I used a 6rpm dc motor. I also used a dc powered color changing LED light strip around the inside of the frame. I sanded many of the gear teeth so it ran quieter. Printed my gears in black ABS and Glow-In-the-Dark ABS. People ask me if this was my original design, but I give the credit to you. Thanks.