Engraving would be about the heaviest duty task I would do on a k40 frame I don’t think it’s rigid enough to cut metal. I struggle with Aluminum on my OX CNC with a little 400w spindle
@Alex_Krause Thanks for that Alex. I intended to attempt to cut 2-3mm thick aluminium with the dremel attached. But if that is the case, I guess a manual test with the dremel is in order before I consider putting into the K40.
Remember to wear safety glasses 
@Yuusuf_Sallahuddin_Y the fire line on moshiboard and psu is active low. One can probably wire it to an ssr instead of the psu to drive the solenoid (with a snub diode!).
@Vince_Lee That’s a bit beyond my electronics experience, however I see what you mean though. So when the laser would normally fire, instead it will have the solenoid “close” (is that the word?) & allow the hinge to drop the dremel into place. When not firing (i.e. when it is normally moving) the solenoid will “open”, moving the hinge so that the dremel is raised? Am I getting you correct?
@Yuusuf_Sallahuddin_Y yes, that’s the idea. One could use a solid state relay to detect when the fire line was pulled down and instead of triggering the power supply to fire, use it to activate a solenoid. The relay isolates the two circuits and allows the low current fire line to drive the much higher current needed to activate the solenoid.
@Vince_Lee Oh right, so that’s what the SSR does. I had no idea what they did. Makes sense when you explain that & I think it would definitely be worth a go.
I really think installing a drag knife to a k40 would be a beneficial tool over a rotary tool would allow for cutting leather,card stock, laminates and pvc based vinyl with no risk of chlorine gas exposure
Any tool other than a laser will require a hold down sytem for stock since a laser has no tool resistance there is no work holding in the cabinet
@Alex_Krause Yeah I want to install a scalpel blade to cut through leather. It would be much nicer than a burnt leather edge. But I’ve realised the blade needs to be able to rotate in order to follow the cut lines nicely. Unless a drag-knife allows it to auto rotate as it goes? & definitely would need some method of holding it down. Currently I hold things with magnets (to prevent the leather curling as I cut) but would need a much more permanent hold for knife setup.
https://youtu.be/bMoRUZnvbXw this is a drag knife it swivels in the tool holder no power required to drive it
@Alex_Krause Thanks. I will check it out.
edit: I’ve actually seen those before. I thought the machine somehow rotated the knife mechanically. Good to know it works without mechanics. That is exactly what I want/need for my leather work. Thanks again Alex.
@Alex_Krause This video shows me a bit more clearly how it works. https://www.youtube.com/watch?v=YqvgA1P5hWg&ab_channel=BrianOltrogge
I was thinking it must be powered rotation of the blade because it is attached to the big motor thing. Then I realised (from the video you shared) that it says “disconnect the power to the spindle when using drag-knife”. Thanks heaps.
I think I posted this video awhile back when you had a wallet you had made
@Alex_Krause I think you may have actually. I knew I’d seen it somewhere haha. I had no idea where though. Thanks again for reminding me, because it would be a great addition to the K40 & probably the best thing that could be added in terms of extra utility (as you mentioned).