This is a connector to fix male and female, inside two pieces Dupont x8, one male side and the other female.
This model is printed in PLA, due to its rigidity, I think it works better.
It does not need any special treatment if the printer is well calibrated.
I designed it for my new printer, it has 16 pins so I can connect two extruders with two layer fans plus the cooling fan, plus the limit switch. Thus the contacts will be removed quickly. Inspired by VGA plugs.