Old Panavise hobby vise, brought back to useful life with SLA and FDM printed parts. Designed to hold circuit boards and quickly attach/detach from your project bench. More here on my blog post about this project:
find yourself an old panavise of some sort at a yardsale.
Print out the parts
get a 3/8"24 threaded screw
attach the base to your table.
voila, instant pcb vise for soldering, desoldering, testing. etc.