Send message when heating is finished and printing starts

[stepjanssen]

I'd like to be able to receive a message when printing is started after pre-heating is done. I now get a message when I click print, but then I keep checking the camera to see when the actual first layer starts printing.

• Stephan

[fraschetti]

Hi @stepjanssen,

The stock set of events in Octoslack come from hooks provided by OctoPrint. As far as OctoPrint is concerned, once your g-code starts running, that's technically the 'start' of the print. The easiest way to accomplish what you described is to inject a bit of custom g-code into your slicer's start g-code template (assuming your slicer support's this if course). From there you can use the G-code event feature introduced in Octoslack 1.4.0 to trigger your event.

As an example, here's my Slic3r 'Start G-code' template; the bold line is where I'd personally inject my 'print has actually started' g-code (basically at the end).

M115 U3.0.12 ; tell printer latest fw version M83 ; extruder relative mode M104 S[first_layer_temperature] ; set extruder temp M140 S[first_layer_bed_temperature] ; set bed temp M190 S[first_layer_bed_temperature] ; wait for bed temp M109 S[first_layer_temperature] ; wait for extruder temp G28 W ; home all without mesh bed level G80 ; mesh bed leveling G1 Y-3.0 F1000.0 ; go outside print area G1 X60.0 E9.0 F1000.0 ; intro line G1 X100.0 E12.5 F1000.0 M117 Print in progress

From there you can simply create a G-code event in Octoslack that looks for M117 Print in progress FYI: The M117 command simply updates the printer's display which is why I picked a string you won't mind looking at if you pass by your printer.

[stepjanssen]

@fraschetti, many thanks for the clear explanation! Will be trying this on my next print.

[fraschetti]

Sounds good. Let me know if you encounter any issues.