The hek lok requires no hardware to attach to the belt, but can use standard tek-lok hardware or M5 nuts/bolts to attach various items to the clip. 

Print instructions:

PETG is an ideal material for the repeated flex of the clip, though PLA+ also works fine. 

Recommended to use at least 2.8mm of walls (7 perimeters @0.4mm width) so that the clip arms print as continuous lines, though as few as 4 walls may work. 

Paint on supports are required at the two downward facing surfaces of the clip hooks as shown below. Recommended to use smart fill to paint the entire surface. 

If paint on supports aren't available in you slicer of choice, just enable supports and use support blockers for the other half of the model. 

utility belt clip clamp tek lok teck lock tech