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A great marble pump with crank handle

by berschwer Dec 23, 2014
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So I printed it out but I'm having trouble getting it to work. I'm using the standard 16 mm marbles. The problem is that the marble has no resistance at the entry point so it never starts up the corkscrew. Instead it gets pushed back up the on ramp. Any suggestions?

I have had the same Problem. Try to fill somme more Marbles into the Pump, so the Marbles were pressed into the Pump.

That would probably work but I need it to do one without extra marbles.