Simple clamp to lock wood pieces onto my homemade carving support that can be seen at http://intagliomanuale.blogspot.com/2014/04/supporto-da-intaglio.html (just italian language). See my 3D printable models collection at https://www.redpah.com/profile/648/mascalTo build you need 3 M6 threaded rods (length 10-15cm), 5 M6 nuts, 1 M6 wingnut and two (equal) rubber bands. Just look at the photos. Printing has just few small critical parts: To assemble, use 4 nuts to lock the two side rods to the moving part and one nut to lock the wingnut to the remaining rod, as shown in the photos. Slots for the nuts should be big enough to compensate for printing tolerance.