Summary

Who hasn't been looking for this d*mn 29 mm crimper head for the beer capping machine just when it's needed at the most. Here is the solution - just screw it to the back of your machine.
I made this particularly for a common machine used by homebrewers, but there are probably many variants out there. So feel free to modify the attached FreeCAD file for your needs. This one has fine metric threads M18 x 1.0. If you change it, remember to increase the minor diameter by approx 0.5 mm to make the threads loose and easy. The gap in the steel bar is approx 11.4mm, you may need to adjust for your machine.
I managed to print this sideways without any support, and the threads still turned out fine. Plain PLA.

Print Settings

• Printer brand:

  BCN3D

• Printer:

  BCN3D SIGMA

• Rafts:

  Doesn't Matter

• Supports:

  Doesn't Matter

• Resolution:

  0.1

• Infill:

  10

• Filament brand:

  3DNet

• Filament color:

  White

• Filament material:

  PLA