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Filament load too short

Having issues correting Mk3 Gcode from generator. Currently, one main issue I'm having is that T0 load doesn't last long enough for filament to reach the direct extruder. Must be a simple fix but still unclear if/how to change any of the automated features on the chameleon side or how to go about this. Any help greatly appreciated

3 comments

3 Comments

Bill

Jul 22, 2023

Ok... it looks like you're combining two different modes of operation and/or installation methods... either the 3DChameleon is acting as the extruder (Mode 1 - Advanced Installation), or you're loading/unloading your stock extruder (Mode 2/3 - Basic Installation.) But it can't be both... they're mutually exclusive. The GCode Generator only supports the Basic Installation... the Advanced Installation (which you physically have set up) requires a lot more work to get working. The Basic Installation should be feeding into your stock extruder, which will feed into the hot end. So, which installation method are you looking for? If you're wanting the advanced, then you need to make sure the stock electronic's extruder wire is connected to the 3DChameleon's extruder, as the stock firmware will drive it directly. You'll also need to follow our advanced installation videos (download our Ender 3 V2 profile) and implement the ReverseDrive.py post processor to allow all four drives to spin the correct direction.

If you want the basic installation, just reinstall your stock extruder (or a suitable replacement, like the BMG clone) and feed the Y adapter into it. Then you can use the gcode generator. Bill

Oisín

Jul 22, 2023

Replying to

Thanks for the quick response! I should have added a few details first post ;P Confirmed Mode 2 currently Cut down PTFE tubing to appropriate lenght for my setup

I use a direct drive hemera extruder but in this case simply see it as a stock extruder, Chameleon splitter feeds into it

I've set the extruder to nozzle lenght to 30mm in gcode generator. Trigger switch activating correctly by printer with test prints so position is correct.

I am not looking for direct drive mode for chameleon as my process depends on my hemera extruder.

To clarify, my problem is that upon loading filament during a tool change from chameleon to my extruder, it never pushes enough filament to reach the extruder. Is the only logical solution to use mode 3 and program a lenght of time for the bed to trigger chameleon switch for duration of filament movement to extruder? or different approach possible in mode 2?

Oisín

Jul 30, 2023

Replying to

I think my issue is coming from this part of my tool change code

; press the button to select the new extruder
G0 X3 Y3 F2000 ; press the button
{if next_extruder==0}
G4 P460 ; dwell for .5 seconds - adjust this to match your machines single pulse time
{endif}
{if next_extruder==1}
G4 P920 ; dwell for 1.0 seconds - adjust this to match your machines two pulse time
{endif}
{if next_extruder==2}
G4 P1380 ; dwell for 1.5 seconds - adjust this to match your machines three pulse time
{endif}
{if next_extruder==3}
G4 P1840 ; dwell for 2.0 seconds - adjust this to match your machines four pulse time
{endif}

G0 X-3 Y-3 ; back off the button

G4 S15; wait for it to happen ; adjust this time to match the actual tool change time - subtract the time it takes to load for the last 1" into the extruder
G0 E75 F2000 ;      << -------   ADJUST THE E50 VALUE TO STOP IT RIGHT AFTER IT LOADS INTO THE STOCK EXTRUDER (50mm is the default)
;                ADJUST THE F1500 TO MATCH THE SPEED OF THE FILAMENT FROM THE 3D CHAMELEON
;                NOTE: This defaults should work, but you can always tune them to be perfect.
G4 P1500 ;          This is just a half second extra reloading time... just to make sure
G92 E0
G90 ; move back to absolute mode
M83 ; but make sure the extruder stays in relative

Any way I can have the chameleon keep pushing the filament a little longer so it makes it to the extruder?