Routalot,
Nice work on the Ferrari emblem. What was your total machine time? Some years back I made a small lithophane and showed it to my wife.... she asked “can you make some of those of the family photo for Christmas presents?” So.... I learned that an 8” X 12” (20cm X 30cm) image took 52 hours!! Plus a set of brushes for the Dremel spindle I used to get the RPM up for the 1mm ball nose bit. It took a bit more than 2 weeks of constant machine time to make all 8 of them. While the CNC was carving the Corian, I made some frames with backlights that were made from the plexiglass parts of dead LCD computer monitors (which works great by the way) and all worked out.
Attachment 422134
Attachment 422132
These were done with Vectric photovcarve.
The .ngc file for LinuxCNC was over 400,000 lines of gcode
Steve