Add a set of picatinny rails to your models or print it as is and clamp it to something. Model has a cavity which is set for a ¼-20 nut as I wanted to mount a scope with rails to a tripod temporarily using the camera screw. Just pause the print and drop in a nut before it prints over the cavity.
Use OpenScads Built in customizer to make a picatinny rail for anything. make it long enough for one optic or make it super long to mount a myriad of accessories.
Cavity for nut is also adjustable for whatever you have laying around.
If you wanted to add threaded insert, set “Point to Point Diameter” to zero and “Through Hole Diameter” and “Thickness” according to your insert.
The author marked this model as their own original creation.