Swapping heads on a delta printer. Awesome stuff. Uses strong neodymium magnets in order to hold the head in place. Doesn’t show extrusion, but it should be possible with a 1.75mm filament bowden setup, as the line should be plenty flexible. There is the issue of the head moving, sliding, etc but I’m sure that’s easily fixable.
http://www.youtube.com/watch?v=f60YuBrHRCA
That’s pretty bloody cool!
Magnets + registration pins should do it.
Better yet, longer magnets that double as registration pins.
Use spherical magnets. 1 sphere mated to a cluster of 3 (forming a tetrahedron) controls 3 degrees of freedom. 1 sphere mated to a pair (forming a triangle) controls two more DOF. 1 sphere mated to another controls the last DOF.
That should be very repeatable and resist side loads well enough for FFF.
I haven’t thought through all the relationships of poles. 3 sets of magnets (1 mating to 2 in a triangle) oriented 120° to each other might provide a better grip. More uniform, anyway.
If you’re going to do registration pins, they should be precisely milled out of metal, rather than printed. There’s too much variation in plastic.
what slicer supports tool changes?