Geeetech

Hi I hope someone can help. I have had my a20T fore about a month and yes it prints very well. But to day I wanted to print something in silver/Grey. !n no 1 extruder I have dark Brown in Extruder 2 I have Silver / Grey and in 3rd extruder I have light brown. Any way that's just info. If I go to mixer. Then Toggle Mix I can go from 1 to 3 extruder but I cant get it to go to No2 Extruder! Can someone tell me what is wrong? I can print in three colour mix 33 33 34 But there is no way of choosing just No 2 Extruder????? Thanks in advance

I have the exact same issue with A10T.

Does anyone have the fix for this?

Hi you said you had the same problem as me? Have you had a answer? I cant get anything from Geeetech I think they are hopeless! Regards Percy Armstrong

buenos dias
yo tambien tengo el mismo problema y no se que hacer

I think its because of the old firmware, which seemed to only support 2 extruder.
I tried to upgrade to Marlin 2.0.8.2 but failed miserably.
I opened an issue for that, and if i get any luck/ answers, ill post it.

I had the same problem with Marlin 2.0.9. Only the E0 stepper would work. 2.0.8 all the mixing steppers would work but I would get too many temperature errors.

I finally decided to take the most recent version of the firmware Geeetech released v2.3 which is based on marlin 1.1.8 and fix a few things that had to do with the 3 mixing steppers.

I fixed the mixing toggle so that you can toggle between all three mixing steppers.

I added a new Mix2 menu item.

The orginal Mix submenu allows you to set the E0 mixing stepper %, then it automatically splits the % balance evenly between E1 and E2. This is where Mix 2 comes in, if the E0 % is set to 99 or less a new Mix2 submenu will show up. Selecting the "Mix 2" submenu will lock the E0 % to what you set via the orginal Mix submenu. This leaves the remaining % balance available for E1, just adjust it to your desired % and the remaining balance, if any, will be applied to E2. It is not the most elegant solution but it works... Hopfully Vert gets Marlin 2.x.x polished up for the A20T.
If you want to give my tweak a try it is on thingiverse...

https://www.thingiverse.com/thing:4904575

Here is how I solved the problem of using the E2 extruder in Cura. In the upper left hand corner tab you see the name of your printer ( Geeeteck A20T) just to the right you see a down arrow. Choose this option, then choose manage printer. You will see two white windows inside a gray window named "Preferences" and Printer. Choose the button "Machine settings", choose this setting. You will see "Start G-Code and a list of G-Codes listed below:
G28
G1 Z15 F300
M107
G90
M82
;M104 S215
;M140 S55
G92 E0
;M109 S215
M107
;M163 S0 P0.33 ;this should have p100 for extruder E1 do not forget to remove the ";" in front of the M163
;M163 S1 P0.33 ;this should have p100 for extruder E2 do not forget to remove the ";" in front of the M163
;M163 S2 P0.34 ;this should have p100 for extruder E3 do not forget to remove the ";" in front of the M163
M164 S4
G0 X10 Y20 F6000
G1 Z0.8
G1 F300 X200 E40
G1 F1200 Z2
G92 E0
G28

You see the lines with ";" at start. These are bypassed by my choice. The lines that have ";M163" at start of line, these set the Extrudes flow. They are at default set at S0 P0.33,S1 P0.33,S2 P0.34. The S0,S1, S2 stand for extruder E1, E2, and E3 respectively. The P stands for the filament flow in percentages. The easiest way is to cut and paste to the 3 Extruder tab and remove the ones for the Extruders not used and place "P100" meaning 100%. If you do not cut and paste, each time you want to use a different extruder in Cura, you will have to remember to go to these settings to change extruders. Otherwise if you do you only have to chose inside Cura parameters for the print settings you are wanting to slice. This should automatically be saved. But to check go out and back in. You will have to click on the Start G-Code window to get it to show. The lines ";M104" and ;M109" set the nozzle temperature, one to wait and one not to wait. The "M140" sets the bed temperature. If the ";" is removed from these, it will override the settings you set in Cura for these settings.

Hope this helps people with these problems. At least this is my work around for these problems. There may be better, but no one has offered them to me.

You are right, the correct answer is in the Start GCODE.

You must remove the 33s or your prints will always mix.