Dual extruder calibration

Snapmaker 2.0
1

Today I installed the dual extruder in my Snapmaker 2.0 A250 and I just can’t get it calibrated properly. The problem in my particular case is that the print head goes a bit too low when printing the XY calibration model. Auto-levelling succeeds but the nozzle smashed into the side of the build plate, actually pushing the build plate away. The magnet couldn’t hold it.

I did the auto-levelling again and this time recorded a video. On this attempt it didn’t push the build plate away, but it can be clearly seen that the proximity sensor pushes into the build plate, and that the left nozzle does so, too. The video can be found here: https://youtu.be/Q0q7kRe23Jw You can use the . and , keys in Youtube to inspect the video frame by frame.

I did update to the latest firmware less than a week ago.

2

I had that problem too. It seems that there are two different sets of screw holes on the back. Make sure that you are using the correct set and that should fix that. Good Luck!

3

I actually tried both sets of holes in desperation. The video has been taken with the correct ones, my previous attempt used the other ones, which was maybe a tiny bit worse but largely the same result.

4

I had this problem of the head smashing into the bed and I had used the correct holes. I connected up a laptop directly with USB cable and ran the ‘factory reset to default’ macro shortcut and then rebooted, re-identified the machine and the dual extruder head and then everything was correct.

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5

That sounds interesting! Where can I find that shortcut? Is it in Luban?

6

In Luban in the workspace section on the right side under the jog controls.

Alternatively you could M502 (for factory reset) and M500 (for save).
You could use live z-offset while printing.

Check your mounting of the toolhead AND your X-linear module.

7

Could you please tell me how to connect my laptop directly to update my snapmaker A350 2.0 to update my 1.8.0 firmware? I tried using a usb and it says it cant read the file over n over

8

Thanks, everyone! My problem is solved.
I disconnected the print head, turned the SnapMaker on, sent the M502 and M500 commands via Luban and then shut it down and reconnected the print head. Upon turning it on again, it went through the auto-levelling and z-height calibration without problems. The nozzles did not run into the print bed anymore and the first print layer had a very good distance from the bed, giving good adhesion without getting squashed. The right nozzle extrudes noticeably less white PLA than the left one extrudes black, but that’s a different story. I’m sure I can figure this out, now that the calibration is finally done. :slight_smile:

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