Ender 3 pro prusa slicer issue

in Getting Started

I used gcode generator switch is on x axis

When I try to print I get invalid extruder, the unknown command m900 k0

I get this on all 4 extruders?

I have 4 extruders

With single extruder mm selected

3 answers5 replies

8 Comments

Bill

Apr 09, 2022

Well, M900 is Linear Advance... it sounds like PrusaSlicer has that setting turned on when it shouldn't.

Bill

Apr 09, 2022

Replying to

I might add, PrusaSlicer is, by a very wide margin, the best slicer for the 3D Chameleon! 😁

Lenny M

Apr 09, 2022

Replying to

@Bill every line i found m900 command its followed by k0 which looking online it says K0 disables linear advance is that correct?

I am using notepad++ to view g code if there is a better program t o view code please let me know thank you.

Also I changed T1-4 to T0

should I change all 4 extruders in the code to 0 as well?

Bill

Apr 09, 2022

Replying to

@Lenny M as for the M900... the printer is complaining that it doesn't even understand the M900 code at all... so my guess is that you need to remove the references to it in your PrusaSlicer config. Check the filament tabs custom gcode setting and remove it there. (That's where I see it on my printer.) As for the last part, I don't quite understand your question... you said "I changed T1-4 to T0"... where else are you talking about? (There is no need to change the Autogenerated Gcode if that's what you're asking, as we never insert a T commands... only comments.) As for Notepad++, you can use anything you want to edit... but I'd suggest that there might be a way to do it via a post processor... again, I've never run into this issue before... but I've seen where Octoprint complained about it, but it should be ignored by the firmware... I've actually never seen a printer complain about it. Is this a custom firmware? If so, maybe it's just a flag in Marlin to turn it off. A simple post processor that replaces those commands with T{#} to T0 or M900 to ;M900 will solve it.

Lenny M

Apr 09, 2022

sorry i left that out its a bigtreetech silent board and touchscreen

so that may be the reason for m900 error?

Bill

Apr 09, 2022

The 3D Chameleon GCode Genearator doesn't use M900 (which is a Linear Advance) command at all, so not sure where that is coming from. As for the Invalid tool, you don't need to include the T parameters in your gcode... it's safe to replace them all with T0 since we're just using a single extruder anyway. Our code, again, doesn't actually insert any T commands, so it's just a matter of simply replacing all T1, T2 and T3 commands in your gcode file with T0. I don't recognize the UI you have there... what kind of printer is the running and what is the firmware? The Ender 3 Pro has the classic type of display, not a color one.