Unistrut Roof Rail end

thingiverse

This end-cap fits 42x22mm extruded aluminum Unistrut roof rails, featuring a slot underneath that allows water to drain out freely. For secure attachment, you can either glue it into place or drill through the side of the Unistrut for use with a self-tapping screw. The item itself is designed as a press fit in most applications, although successful installation may depend on the tolerances of your printer and the specific extrusion used.