H&K UMP 45 (Prop)

WORK IN PROGRESS

Modeled off of reference pictures, many dimensions are guesses.

This is intended to be a NON-Firing, but bolt operable, replica.
can be printed entirely in PLA (if possible, the charging handle and magazine spring is better printed in petg to retain its springyness)
you will need a large print bed, I printed mine on a 300x300mm print bed.
Test out the magazine spring, upper rear body and stock parts to see if your print area is large enough.

printed with supports, with roof and floor supports enabled.
0.2mm layer height, 20% infil
300x300mm bed was used,



Things to do:

- Re-orientate STL files to match intended print orientation.
- Re-design the spring rod to be printed horizontally and in less parts
- Selector is a little loose, may need to adjust dimensions and/or spring length.
- magazine spring is too weak to push up the bolt catch for empty magazines.
- magazine needs work to improve feeding.
- feeding and shell ejection still needs fi