K40 (mini) upgrades

OK, go ahead with more specifics to get more specific help! What questions about grounding weren’t answered in Laser safety: Light and Electricity ?

Typical advice on the power supplies has been that they don’t do well with adding much load. K40 enhancements and modifications says

The K40’s stock power supply is adequate, just barely, for K40 operations. If you add stuff on (like LED strips for viewing the lasing through the window while engraving, or for better visibility to set up stock to work on) it may cause issues because the power supply is just barely able to put out the power.