Spring Clamp

Excellent design of Helping-Hands Clamp from Tonyno, but I wanted it to have a 5.4 mm barrel on the end to fit Articulated Arms Toolset for PCB Workstation (FDM-optimized)
by giufini (https://www.thingiverse.com/thing:2503503) at the same time I removed the hard support as the generic one in Slic3r is cleaner to remove, plus I resized it in metric