Tube with spiral way

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This tube has 3 spiral ways inside the wall. You can put a 5mm ball in the entrance and let it slide. If you use the magnetic ball, you can control the balls, or make a chain and get through the spiral way.The outfline of this tube is parabolic. I hope you like it. 

About the author:
amazingafanti
I like mechanical design. listen to music, paint, watch movies football (Barcelona fan), formula 1 and formula E.

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