(beginning of start.txt)
G21 (set units to mm)
G90 (set positioning to absolute)
G92 X0 Y0 Z0 (set origin to current position)
M108 S255 (set extruder speed to maximum)
M104 S220 T0 (set extruder temperature)
M109 S110 T0 (set heated-build-platform temperature)
G1 X20 Y20 Z7 (move to waiting position)
M6 T0 (wait for tool to heat up)
G1 Z0 F3300.0 (Go back down)
G1 X0 Y0 Z0 F3300.0 (move to origin)
(end of start.txt)

