Gravity Well

This is a classic physics gravity well demonstration. It uses about forty 6mm diameter plastic Airsoft BBs that get pumped up to the top of the funnel and spit out tangentially. It prints in 3 pieces without supports. Note that at the output end of the feed tube, there is a cantilever arm with a little bump on the end as shown below:You will need to use an Xacto knife or other small blade to free up the little cantilever arm after printing. The little bump at the end of the cantilever impedes th