Find attached my 6 nozzle holder for the machine. It uses 10mm round magnets I got for AliExpress (larger than needed, It's what I had) . It uses the current mounting holes on the machine. I found the holder the machine came with was too tight and would jam when sliding the nozzles in and out. I printed mine and PLA and it's been fine. Print laying on its back.
Loading a nozzle is done in a square C shape with enough Y movement to have the nozzle clear the holder towards the front. As I move the nozzle out of the holder (3rd movement) i move the nozzle up 0.3mm
Spacing is 20mm
Licensing for my STL is - Creative Commons - Attribution - Non-Commercial license