start gcode placed unfortunate in the middle of initialization

[JohK]

The way the start gcode is currently wedged in between some initialization commands doesn't allow to switch on the power supply (M80), nor does it allow custom pre-print extrusion (i.e. to mimic cura behaviour of lifting the nozzle before printing).

M107
M190 S85 ; wait for bed temperature to be reached
M104 S235 ; set temperature
M80 ; turn on power    << custom start gcode, nahnahnah too late
G28 ; home all axes    << custom start gcode
M109 S235 ; wait for temperature to be reached
G90 ; use absolute coordinates
G21 ; set units to millimeters
...

[alranel]

Put the following in your start G-code:

G90 ; use absolute coordinates
G21 ; set units to millimeters
M80 ; turn on power
M140 S[first_layer_bed_temperature] ; start heating bed
G28 ; home all axes
G1 Z5 F3000 ; lift nozzle
M190 S[first_layer_bed_temperature] ; wait until bed finishes heating
M109 S[first_layer_temperature] ; heat extruder

I've been considering to make this the default start G-code for a while.

[JohK]

Thanks for that code I put it in as start gcode. It works now, but there is still an additional G21 command inserted in front of the start gcode.

G21 ; set units to millimeters << where comes this line from? M107 G90 ; use absolute coordinates G21 ; set units to millimeters M80 ; turn on power M140 S85 ; start heating bed G28 ; home all axes G1 Z5 F3000 ; lift nozzle M190 S85 ; wait until bed finishes heating M109 S235 ; heat extruder

[alranel]

What's the problem with it?

[JohK]

It's not a problem, just wasn't sure if this was intended behaviour.