C-Clamp

A robust clamp with a swivel foot.  This is based off the same idea as my earlier sash clamp design https://www.printables.com/model/59250-sash-clamp but is just a one piece body, no wood required.  I wanted it for keeping boards aligned during glue-ups and for clamping jigs to boards. 
  It prints laying down so that the layers are aligned for maximum clamping strength.  No supports required.  Designed to use a fully threaded bolt and captured nut.  Will accept either ½"-13 or M12 bolts.  2 different handle designs are provided, one for carriage bolts - which are often fully threaded, and the other for hex bolts.  For this size clamp a 4"/100mm  long bolt is ideal.  If you can't find a fully threaded bolt in that length, you can do what I did, and glue a nut onto a section of threaded rod.