Box Steel Tube feet or end caps 75x40mm
thingiverse
Some feet/end caps for rectangular box steel with an outer dimension of 75x40mm (internal: 68x33mm). It has a 3.5mm lip to provide some protection from the sharp edges of the steel if it's sitting on carpet etc. There are small domes on the tabs to provide self-gripping to the inside of the tube - they are quite sturdy and shouldn't fall out if you need to pick the frame up when using them as feet (how I am using them). The steel I am using has a seam on the inside, the placement of the tabs allows a gap for that to no interfere. The tips of the tabs are chamfered to allow for easy pushing into the tube.
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