Toolhead preheat prior to a tool change.

hestiahuang

@dc42 said in Toolhead preheat prior to a tool change.:

We plan to implement this on Duet 3, by having 2 readers reading the same GCode file. Reader #1 will do the printing, while reader #2 will run in simulation mode and stay ahead, so that it can tell #1 in advance that a tool heater should be switched to active temperature, or (for a mixing extruder) that the mix should be changed.

On Duet 2 there probably isn't enough RAM to do this easily, because of the additional DDAs needed to run a simulation in parallel with a real print.

Cura has a facility to advance tool heating and I believe some users have it working with Duets

Any good news about this feature? 4 years passed, it should be big improvement for the multiple tools change.

jay_s_uk

@hestiahuang it's part of the 3.5b1 release a few weeks back

hestiahuang

@jay_s_uk said in Toolhead preheat prior to a tool change.:

@hestiahuang it's part of the 3.5b1 release a few weeks back

Really? I may miss the milestone. Thank you so much!

hestiahuang

@jay_s_uk said in Toolhead preheat prior to a tool change.:

@hestiahuang it's part of the 3.5b1 release a few weeks back

Sorry, need to distube you again. I read the change log carefully, however I can't see any description about this part. Any idea about the details of this change?

https://github.com/Duet3D/RepRapFirmware/wiki/Changelog-RRF-3.x-Beta#reprapfirmware-350beta2-in-preparation
https://github.com/Duet3D/RepRapFirmware/wiki/Changelog-RRF-3.x-Beta#reprapfirmware-350beta1

Rushmere3D

There is a 3rd party PrusaSlicer post processor for this if your interested?

o_lampe

@hestiahuang I proposed to establish a tahead.g macro which runs, as soon as the look ahead planner finds a toolchange.
This could probably be too late, depending on the length of look ahead.
Finding the best solution is way harder, since each line of code can take longer or shorter.
My dual extruders always run at full temperature. Even when a tool is parked. I park the nozzle over a piece of nylon to prevent oozing and purge the tool, when it's reactivated.

jay_s_uk

@hestiahuang its part of the multiple motion support. https://github.com/Duet3D/RepRapFirmware/wiki/Changelog-RRF-3.x-Beta#reprapfirmware-350beta1:~:text=[Duet 3 MB6HC] [Duet 3 MB6XD] [Duet 3 Mini] Multiple motion systems are supported. See https%3A//docs.duet3d.com/en/User_manual/RepRapFirmware/Multiple_motion_systems. Caution%3A this feature is experimental and may not be fully working in this release.
there are now 2 gcode streams. however, how a user chooses which gcode stream is used I am unsure of

o_lampe

@jay_s_uk I guess these links won't work

jay_s_uk

@o_lampe works fine here (using googles copy link to highlight function)

o_lampe

@jay_s_uk You've posted one link, but it contains two http....addresses?

jay_s_uk

@o_lampe click it and see.....

o_lampe

@jay_s_uk said in Toolhead preheat prior to a tool change.:

there are now 2 gcode streams. however, how a user chooses which gcode stream is used I am unsure of

What I'm gathering from it is:

you slice two different parts (located at different places on the bed)
each part has it's own gcode file
In their start code you specify the tool number with M596 (both files will have X,Y and E components, but we don't need postprocessing to rename XY axes)

What I don't get is, how it will handle layer changes
And it doesn't preheat a tool, since both tools are working

hestiahuang

@jay_s_uk said in Toolhead preheat prior to a tool change.:

@hestiahuang its part of the multiple motion support. https://github.com/Duet3D/RepRapFirmware/wiki/Changelog-RRF-3.x-Beta#reprapfirmware-350beta1:~:text=[Duet 3 MB6HC] [Duet 3 MB6XD] [Duet 3 Mini] Multiple motion systems are supported. See https%3A//docs.duet3d.com/en/User_manual/RepRapFirmware/Multiple_motion_systems. Caution%3A this feature is experimental and may not be fully working in this release.
there are now 2 gcode streams. however, how a user chooses which gcode stream is used I am unsure of

Great to hear that, even it is for Duet3 6HC. Thanks a lot!

hestiahuang

@o_lampe said in Toolhead preheat prior to a tool change.:

@hestiahuang I proposed to establish a tahead.g macro which runs, as soon as the look ahead planner finds a toolchange.
This could probably be too late, depending on the length of look ahead.
Finding the best solution is way harder, since each line of code can take longer or shorter.
My dual extruders always run at full temperature. Even when a tool is parked. I park the nozzle over a piece of nylon to prevent oozing and purge the tool, when it's reactivated.

Any link about your tahead.g? Oh... I think I can check your post history and locate it. Thanks!