Fits nice, printed in white ASA infill 40%

Looks good and fits well on din rails!

Fits absolutely perfect. Printed in Spectrum PETG Lime Green (250° and 90°). (edited)

I printed these out for work so unfortunately I can't show a picture of them mounted on a rail, but the design is really nice and it prints so much quicker than other designs I've found! For the heat-set inserts, I used these M3 inserts form Adafruit:
https://www.adafruit.com/product/4256
Just keep in mind if you use M3 screws it will take a bit of force the first time you screw it in to widen the M2.5 screw holes on the Pi.
I printed mine in Prusament Galaxy Black PETG, but other materials might work as well.