K40 safety switch holder/anvil

thingiverse

The K40 laser ships without a safety switch to prevent firing while the lid is up. Upgrade your laser's safety by wiring a switch into the on/off switch - this holder positions it correctly for optimal performance. You can use a switch like https://www.amazon.com/gp/product/B07MW3W79B, which measures 20x10x7mm. Any microswitch with these dimensions will work with this holder. To install, you'll need to snap or cut off one of the legs on the holder depending on your switch's orientation and wiring needs. The holder has two legs to accommodate different configurations. The anvil is a small box that acts as the actuator for the switch due to the thin lid wall. Hot-glue the holder and anvil in place when you're satisfied with their positioning, and you'll be ready to use your upgraded laser safely.