PCB-Drill with Dremel & 3D-Printer

This is an attempt to abuse my cheap Prusa i3 clone as a PCB-Drilling machine by temporarily attaching a Dremel next to the extruder.
The plan is to let the printer first drill the holes in exact positions and to spray the PCB with photoresist afterwards, to place the foil with the printout of the PCB in a precise manner by using the holes as marks.

I design my PCBs with gEDA/pcb and convert it's GCode-export to GCode suitable for 3D-printers with very basic perl-scripts I've written for th