(start of start.txt) M92 E865.888 (the number of extruder steps to take in 1mm of filament) G21 (metric values) G21 G21 (all the extra G21 commands are comments - skeinforge eats lines without a gcode) G21 G90 (absolute positioning) G21 G28 (move X/Y/Z to min endstops) G21 G21 ( if your prints start too high, try changing the Z0.0 below ) G21 ( to Z1.0 - the number after the Z is the actual, physical ) G21 ( height of the nozzle in mm. This can take some messing around ) G21 ( with to get just right... ) G21 G92 X-60 Y-120 Z0.4 E0 (reset software position to front/left/z=0.0) G21 G1 Z15.0 F400 (move the platform down 15mm) G1 X0 Y0 F3500 (go to the middle of the platform) G92 E0 (zero the extruded length) G21 G1 F75 E5 (extrude 5mm of feed stock) G1 F75 E3.5 (reverse feed stock by 1.5mm) G92 E0 (zero the extruded length again) G21 M1 (Clean the nozzle then press YES to continue...) G21 G1 Z0.0 F400 (back to Z=0 and start the print!) (end of start.txt)