Magnetic connector for fan - ROBO3D

I'm using this magnetic holders since 2 years and they're doing great job for me. Fast atachement to the carriage, fast replacement with other fans (more silent or more powerfull). An the main reason - fast access to hotend.

As you can see - I've designed small holder that fits place in Robo R1 carriage an it's fastened with a single screw. This holder contains two 6x6 round neodyme magnets that are pushed to the holder's holes with some unstripped wire. This wire is soldered to right wires