Summary

Just the beginning of a quick idea for a T Clip substitute when you don't want to take things apart or buy the roll in type of tclips. Still needs a little tweaking, but overall a good working idea for a quick mount of fans,etc.

Instructions

I printed this with a .35 nozzle and .25 layers. I didn't use support, but had to clean up the underside of the clip afterwards. Maybe support would be easier. I made the main hole a little small if you wanted to just use a screw in it, or you can use an M3 screw and a nut on the backside. Again, I made the nut area tight so it would hold the nut well, but still needs some fine tuning.
To install, just lock a nut underneath (or nothing if using a screw), place the tab into the extrusion, and turn 90 degrees while pressing in on the center a bit. It will lock in place when fully installed.

Twist lock extrusion clip for 2020 extrusions