XH 2.54 to DC3/IDC connector

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

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

Recommended settings:
print slowly with good cooling, 0.4 mm nozzle, 0.1 layer height except for 1st layer
Reducing accel a bit might help if using input shaper

freecad and STEP included