Magnetic helping hands for soldering

These are simple devices to hold wires in place while soldering. They can be fitted with a magnet to allow them to mount to a metal surface in different orientations. 

To build the model, as well as the three printed parts, requires a 5 to 6mm in diameter spring approximately 30mm long. Slightly longer springs increase grip force, shorter springs make opening the jaws easier. I used the stainless steel 38.5mm x 5.63mm spring from RS, part number 821-374 cut down to 30-ish mm long. 

There is a recess in the base for a 5mm long x 5mm diameter magnet to hold the unit to a steel base. This can be pushed in and will hold.

The base of the print that retains the spring can be snapped into place and will hold against light pressure on the button. Good for testing. Once you have got the unit how you want it I would suggest adding a spot of superglue. 

Print the body of the unit upside down with the tongue against the print bed and the central cavity upwards. Print the moving arm the correct way up with the button stem pointing away from the bed. Print the base cap with the spring retaining cone upwards, pointing away from the bed.