I designed this picatinny rail to mount a red dot sight on my CZ75SP01 Shadow.
Printed out of PETG, as it's heat resistant and stiff enough.
I tried to use ABS but it failed as my printed dont have a heated enclosure.
I used 0.2mm layer thickness.
May be used on any other handgun with a picatinny rail under the frame, but the room for the iron sight may be inapropriate.
You'll need M5 nuts and M5x35 CHC screw.
I've tested this at the range, 100 rounds and work like a charm.
Hope you enjoy :)
I sliced this part with Simplify3D, i recommend to lay the STL as in the picture and use support everywhere but in the screw/nuts holes, as it could be difficult to remove inside those small areas.