It's a redesign of original speed square holster. Inspired on thingi, and on Youtube, time 4:04 https://www.youtube.com/watch?v=gNhWpuWvtEA&t=245s - holster for Swanson speed square.

I don't recommend Swanson, as it is not precise, it is only pricy.

Milwaukee (on picture) is a speed square which I can really recommend. I have also large DeWalt, which is small step behind Milwaukee.

It can fit any speed square, which has it's square 28mm thick and triangle thickness 4mm.

My version is slanted by 3 degrees for comfort, could be even more.

I made a left and right side version, I use the left version - speed square on the left hip and pencil on the right.

It is prepared for BELT CLIP 16mm wide and 68mm long, with 4mm hole. Use 4mm screw.

Print it with 0.25mm layer and in standing position, it's wider side parallel with Y axis for stability. Slow down print after 1/2 is printed, also for stability (on bedslingers, on corexy doesn't matter).