Magnetic Coupler for filament guide (3030 extrusions)

I used this magnetic coupling on my old Prusa i3, and found it very convenient to use.

On my new VCore 3, I mounted a spoolholder on top and needed a reverse bowden for the filament path. Since I also want to use my Palette Mosaic with the printer (and maybe an ERCF in the future) I wanted it to be easy detachable if needed.

The base plate fits to a standard 3030 extrusion and can be mounted with a M5 or M6 screw. The arm of the filament guide can be rotated as needed.

Print the parts in PETG with 4walls (0.4mm nozzle) as well as 0.2mm layer for best result. No supports needed.

In the base plate you finde a sacrificial layer to help print the hole. just drill it open with a 4mm drill after the print.

For the arm you need a M3 insert as well as a M3 8mm to 14mm screw (whatever you got, the hole is deep enough).

The magnet is OD=10mm, ID=4mm, height=5mm and is a press fit into the arm.

Make sure for correct orientation. 

Best solution as I found is, that all mountings on the frame or on devices show the north pole (for example). So the reverse bowden has south poles on both sides.

That way you will never have a problem connecting your components.

Last step is to cut a small piece of PTFE tube and press it into the magnet . Than cut it flush with a knive.

For the hand grips of the reverse bowden, just place a magnet on the mounted arm connector and press it in. Getting the PTFE tube inside is now the hardest part, because it is also a press fit. If you use a drill and the hole gets too wide, the PTFE tube migth slip out during heavy use.

Don't let the magnets smack together or they break!

other magnetic coulpers:

Orbiter extruder: https://www.prusaprinters.org/prints/112074-magnetic-coupling-for-filament-guide-to-orbiter-ex

Mosaic Palette 2s: https://www.prusaprinters.org/prints/65505-mosaic-palette-2-spro-magnetic-coupler