I have made a clone of the Ender Falcon height block for setting the laser at 3,  5 or 7mm above the part depending on material or cutting depth  it has a print in place magnet, add an M0 after layer 17 if printing at the .2mm layer height check for fit and if the magnet is above the printing plane add a 2nd M0 on layer 18 and recheck or drop in the magnet with thin 2 sided tape. On my printer layer 18 was the layer to stop on. For M0 support on a Neptune 4 pro make sure printer.cfg has the following this may work on other klipper printers as well

[pause_resume] ←should be near line 300 if your text editor show line #'s

[gcode_macro M0]  ←----add these 3 lines below it

gcode:

PAUSE

this fix for the lack of M0 support is for Klipper not marlin printers