So someone had mentioned the idea of easier swappable hotends. I spent a little bit of time thinking about a completely 3d printable hotend mount and this is what I came up with. This is just the mechanism that would hold the hotend to the extruder. The biggest problem with this design though is keeping the tolerances tight enough so there is no play. Therefore I am considering this design a failure. Magnets are definitely IMO the best solution for this problem. But I’m curious, does anyone else have a better idea?
I made this snap in one to hold the e3d onto my DIY printer https://photos.google.com/share/AF1QipNDFyHSubbNRrPS6g4SYgBamozC3ufXcQynEnA8uiVu9TZxabc-QOA53B76IkdlXQ?key=VWlteHdhQWZyZ3M4d2hiTnVjckVtM1VhdmFGOE5B
I make the entire extruder block (hotend and motor) swappable. Makes it easier to go between, say, regular E3D, volcano, and chimera.
Oh and there’s a filament sensor ‘riding the line’ in that pic 
Look for quadlock, there are some designs on thingiverse available. Take it as an inspiration for geometry, it is patented.
What are hotends if you dont mind me asking. …im new to the 3d printing world
What if you were to embed a small strong magnet into the stop-ends of each of the three tracks?
Ball springs