I loved the design of this Magic Magnet Tool by tjdesign, but with my 0.6mm nozzle I had trouble with the pin and threading. So I redesigned it to be a bit simpler.
The tool is printed in 2 pieces, cap and shaft. Print support-free in the orientation as downloaded.
Either press-fit or superglue an 8x3mm neodymium magnet into both the cap and shaft for an easy connection between the two.
I used Fuzzy Skin in Prusa Slicer to add a texture to the outside, but it's not necessary.
The author remixed this model.