4 inch rectangle tube end cap
prusaprinters
A customer contacted me and asked for a part that could fit in the end of a metal beam he had and hide what was inside while allowing the air to circulate. I made this insert that is printed in two parts and assembled with 3mm cap screws. If you print it and it is too loose for your taste, put a rubber band around it and it will be stiff enough to stay in and still removable.
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