XH 2.54 to DC3 connector

DC3 is actually too small for this, so it's a tight fit. But it works

Customizable parameters and step export in the freecad file (sorry for the haphazard structure)

Print slowly with adequate cooling and get ready to sacrifice some tweezers

Update: Alternatively, the DC3's pins are long enough for regular female duponts to work alright. 

Recommended settings:

0.4 mm nozzle, 0.24mm 24mm/s first layer, 0.1 layer height
Reducing accel a bit might help if using input shaper