G2S Pro Dual extrusion Z level issues

3DSarge
Posts: 7
Joined: Mon Nov 14, 2016 9:17 am

Re: G2S Pro Dual extrusion Z level issues

Post by 3DSarge » Thu Dec 15, 2016 4:10 pm

Maybe :roll: Having checked out that version of firmware, it appears to be identical to the one I have issues with.
My experience with the G2S so far is that I've spent a disproportionate amount of time between tinkering with firmware and actually printing. I do some commercial printing so I can't have an unreliable machine.
The good thing about this is that my conversion will be able to use a 300mm square bed!

aleXall
Posts: 15
Joined: Mon Dec 05, 2016 3:36 am

Re: G2S Pro Dual extrusion Z level issues

Post by aleXall » Wed Dec 21, 2016 6:27 am

Yes, I do confirm I've fixed Z level issue when extruders switch.
Now when I do it manually/by code with T0/T1 codes, Z levels
are right.
It's important to set corrrectly the boolean values as follows

Image

I've restarted from beginning with firmware programming, downloading
the right version (http://www.geeetech.com/forum/download/file.php?id=1560)
of zipped firmware for my printer (G2s Pro) and updating
row by row with attention the right necessarily values in configuration.h.

During dual extruders tests I've discovered another issue related to G29 code.
It seems that G29 position at the start of g-code affects proper
functioning of ABL. In the Slic3r resulting code, you
can see that G28 e G29 instructions come after some others:

Code: Select all

M107
M190 S70 ; set bed temperature
M104 S203 T0 ; set temperature
M104 S205 T1 ; set temperature
G28 ; home all axes
G29; Auto-calibration
G0 Z50 F3000 ; lift nozzle

M109 S203 T0 ; wait for temperature to be reached
M109 S205 T1 ; wait for temperature to be reached
G21 ; set units to millimeters
G90 ; use absolute coordinates
M82 ; use absolute distances for extrusion
G92 E0
T0
G92 E0
G1 Z0.400 F7800.000
G1 E-2.00000 F2400.00000
G92 E0
G1 X-9.039 Y14.000 F7800.000
G1 E2.00000 F2400.00000
G1 X-9.039 Y33.720 E2.70261 F900.000
G1 X-9.436 Y36.057 E2.78706
G1 X-10.583 Y38.131 E2.87150
...
I've tried to edit it in the following way and ABL
routine starts and works properly:

Code: Select all

G28 ; home all axes
G29; Auto-calibration
G0 Z50 F3000 ; lift nozzle

M107
M190 S70 ; set bed temperature
M104 S203 T0 ; set temperature
M104 S205 T1 ; set temperature

M109 S203 T0 ; wait for temperature to be reached
M109 S205 T1 ; wait for temperature to be reached
G21 ; set units to millimeters
G90 ; use absolute coordinates
M82 ; use absolute distances for extrusion
G92 E0
T0
G92 E0
G1 Z0.400 F7800.000
G1 E-2.00000 F2400.00000
G92 E0
G1 X-9.039 Y14.000 F7800.000
G1 E2.00000 F2400.00000
G1 X-9.039 Y33.720 E2.70261 F900.000
G1 X-9.436 Y36.057 E2.78706
G1 X-10.583 Y38.131 E2.87150
...
My "adventures" with G2s Pro continue to the next level :?
I'm changing broken pulley belt bearings and above all hotends
clog both with PLA and ABS... but that's another story!

dohabandit
Posts: 7
Joined: Sun Mar 06, 2016 6:05 am

Re: G2S Pro Dual extrusion Z level issues

Post by dohabandit » Sat Aug 25, 2018 9:39 am

I could never get the dual extrusion to work well. I would level the heck out of everything.
First the stage itself. using dial calipers and precision 10mm spacers under the wingnut areas.
Then the homing position set screws, etc.

Getting one extruder tip to level usually produced excellent prints, but the second extruder if it was installed would keep touching the already printed PLA material from time to time just enough to mess up the prints. Sometimes it would knock over the part being printed.

I am thinking the mixing type nozzle is a better approach, but the problem with those is the hot end is melting all the colors at the same time. When one filament is pushing, it can push the melted filament up into the other color direction. I tried one of these for a while and it was a pain in the ass too. I have basically given up on multi-color printing. NOT WORTH THE HASSLE.

Love the G2S Pro though. Was really fun getting it setup and working.

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