Bento Mini Magnetic Mount for K1 Max

Connect a JST extension cable to the unused fan port on the motherboard, then connect the fan to that extension (for easy removal):
https://github.com/Guilouz/Creality-K1-and-K1-Max/wiki/Boards-Layout
 

To hold the filter, from the other side of the case make a stack 10x4mm magnets using the hexagon holders 

Add this as a 4th pin in printer.cfg(need root):

[output_pin fan4]
pin: PA0
pwm: True
cycle_time: 0.0100
hardware_pwm: false
value: 0.00
scale: 255
shutdown_value: 0.0


and in the slicer add custom gcode (under Filament for ABS / ASA):

SET_PIN PIN=fan4 VALUE=255
 

Now to see if it actually stays in place given how much this machine shakes.

Please see original model for print instructions.  F360 file provided in case you want to remix for different magnet sizes.