Square Tubing Connectors - Complete Set
thingiverse
This provides the complete set of all nine possible square tubing connectors. Also provided is a special fixture to allow you to find the optimum fit for your tubing. The default STL files include all the fittings for 1/2 inch (12.7 mm) square tubing. The inner dimension of 9.4 mm should provide a nice snug fit. If not, the fixture should help you determine how much to adjust that value.
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