These tiny pliers print in place without supports in about 45 minutes. They've got notched jaws for grabbing nuts or circular items, and have a built-in opening spring for easy manipulation.

They have a 0.4mm gap around the pivot pin, so make sure your printer is calibrated to handle relatively small gaps. There is also a horizontal gap of 0.2mm between the jaws that should provide just enough separation to allow the two jaws to break free easily after printing. Therefore, make sure you use a 0.2mm layer thickness to maintain this gap.

After printing, give them a good squeeze. If your printer is well calibrated, they will break free. If not, they will just break. Good luck!

Update (5/20/22) to v02: 
Spruced up a few things: added gription nubs to the handles, re-angled the jaw notches to better grab hex nuts, and added some tiny serrations to the jaw tips.