3 way corner for 1" square tube

3 way corner for joining corners of 1" square tubing. Build a frame similar to the Rigidbot.
Open hole version allows one tube to pass through.
Designed in mm. 4mm wall, 25.4mm(1 inch) square inside.
Prints with no support material.
Added pads to keep the print glued to the bed.
Added a version with shorter legs that prints quicker.
Scale up to allow for shrinkage.