Simple Cam Clamp
Here is a simple little cam operated clamp to use in the workshop.
Suggest printing the base on its side so that in use the layers are not in tension. Might also need to make the pin out of steel rod as it will no doubt be a weak spot.
PLA would be a good material for this as it needs to be quite rigid.
Screw and nuts are M6.
Designspark Mechanical file included so you can change it to suite your needs and the accuracy of your printer. Enjoy.