Spiral Executive Toy
thingiverse
Simple but addictive toy. Turn it over and the ball runs down. This model is designed to have no supports to enable the ball to be placed inside during printing. The ball is encased and will not come out, without breaking the model. This model requires a 11mm or 7/16" ball bearing (not included) available many places but here are a couple of links: https://www.amazon.co.uk/11mm-Chrome-Steel-Ball-Bearings/dp/B002SS16QY https://www.amazon.com/Inch-Chrome-Steel-Ball-Bearings/dp/B01AX1MSKU Note: Print in the orientation show in the picture (across the build plate) to make it easier to add the ball. You could either just drop the ball in when the printhead is to one side (please take care) or put a pause in the print when slicing.
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