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This lego great ball contraption miniloop features a redesigned Cardan mechanism to lift the balls up. It is designed to be as reliable as possible while still being interesting. One of the parts that make it extra reliable is the loading mechanism having two technic pins to stop more than one ball rolling out at once. It can be powerd by a M motor or by hand but if you power it by hand you have to do it at the exact right speed, so it it better to use the motor. The mechanism uses two 12 tooth gears meshing together witch normally dosn't work to well but because they are slightly more than 2.5 studs apart it work well. If you want instructions I have the .lfx file here on Bricksafe or video instructions here.

Lego GBC Cardan Lift Miniloop PhotosLego GBC Cardan Lift Miniloop Photos

As you can see the differential gear is held in place by a 16 tooth gear, it works well but if it jams it separates you have to fix the timing of the whole miniloop. I am planning to reinforce it in the future with a 3L technic beam.

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