Lab holder

Here is my lab holder. The holding pads can be interchanged so different versions can be used. (Only one type at the moment.)

Pads: PETG 100um
Arms: PLA 150um, fill 30%
Screw/nut: PLA 100um, fill 40%

The pads are printed in PETG because else the holder tabs will break off.
The pad holes in the arms are designed to be 5mm, but most printers will make them a bit smaller. I hand-drill mine to 5mm for a better fit for the pads.

The spring is homemade from a 0.6mm piano wire.
The idea is to insert a 10 mm metal rod in the end of the holder and then attach it to another holder, see the picture. There is a 3mm screw hole in the bottom to fasten the rod.
I have glued some cork to the pads so the grip is better and cork can also withstand the heat from soldering.