A fully functional printed C-clamp with a real screw thread. Spin the handle to drive the swivel shoe down and clamp workpieces, glue-ups, and jigs. Three snap-together parts — frame, screw, and pressure shoe — no hardware required.

3 parts: C-frame, threaded screw + handle, swivel shoe
~48 mm throat opening, ~101 mm tall frame
Prints support-free; print in PETG for stronger clamping force
Tip: tune horizontal expansion so the thread turns smoothly; a drop of grease helps