Like TimSav itself, my machines and Z-mechanisms nowadays are designed for very light tools and cutting forces... i.e. laser, pen, marker, needle-cutter, etc. You might possibly get away with drag-knife and dremel depending on materials you are cutting and how heavy-handed you get... but I've not set them up for that; i.e. no STLs.
If you want to get into light milling/engraving, you should probably be looking at
MPCNC (if you're a DIY guy)... lots of 3d-printing, lots of STLs, and lots of versatility and fun.
-- David