Knob for Magnet
by holgero, published
I have some small strong magnets (like these: http://www.crazy-magnet.de/en/products/3::25/10x-disc-magnet-%C3%98-6-x-2-mm-nickel-plated-strength-ca.-680-g) that are much better in holding paper on a white board than conventional magnets. Their disadvantage is, that they are too small to grip them when they stick to the white board. So I designed a knob for them.
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Choose your design: The first design (the modules knobA() and knobB() in the openscad file) has a hole that goes through the knob from the top to the bottom layers (make magnetZ equal to 1-3 layers height) where the magnet goes in and a plug to stuff in on top.
The second design (module knobC()) has just a recess in the bottom and you can glue the magnet in that hole with super glue after printing.
The rest is simple: render, slice (I used 0.4 mm layer height), print (I printed them with red and green ABS).