I've been tinkering with this idea for a little while and designing and printing a few iterations. It's my take on magnetic clamp posts for, primarily PCB's, but also super useful as a helping hand for many items. There's not a huge amount to them, designed in FreeCAD, there are 3 small parts to print. The base has a captive M4 nut and a captive 12mm diameter x 2mm thick Neodymium magnet. Above that a 40mm machine screw/bolt has a compression spring under a floating clamp section and an upper clamp section at the top. They work, even if this sounds like blowing my own trumpet, incredibly well!
For a base there are lots of options. I've used mine stuck to a random piece of invar steel that's been lurking in my shed for an age, but also they can clamp to say a small tobacco tin, or a really nice option can be a small whiteboard.
I may well make up a few sets to put on my Tindie store, and I'm also going to chuck the repository (where you can download all the files) in for OSHWA certification.
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