Reuleaux Triangle
cults3d
That solid is of constant width. It will roll between two parallel planes. Print with no supports reuleaux_triangle_top.stl , bottom and plug. flat face down. Cut in 2 halves for cleaner print. With a plug for connection. If you have a little elephant footing on the plug, good. Push the plug foot first in one side. It will lock. Don't really need glue. It seems to hold as is.
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