Workbech PCB holder, similar size as "Weller ESF-120" which costs ~$50. To make this one it will cost you ~$5, you can easily buy all metal parts in your local DIY store as it's made from largely available components.

Bill of material:

• 2x 30cm M8 threaded rod
• 8x M8 nut
• 2x M8 large washer
• 3x M6 large washer
• 1x M6 washer
• 1x M6 or M8 spring
• 1x M6x30 hex bolt
• 1x M6x90 hex bolt (length depends on your spring length)
• 2x M6 nut with nylon
• 1x M4x20 bolt
• 1x M4 nut
• 1x M4 washer
• 4x small pieces of school rubber (to prevent moving on the bench)
• piece of sponge/foam to hold components with arm

To print

• 1x Frame
• 1x Frame Notch
• 2x PCB Holder
• 4x Nut Holder
• 2x Nut Dome
• 1x Shim
• 1x Knob Handle
• 1x Arm
• 1x Arm Sponge

If you wish to edit source, this library is used for bolts&nuts