A350 Proximity sensor not working?

Snapmaker 2.0
1

After more than a year waiting I received my A350 today and assembled it for 3D printing.

When I wanted to do the autolevelbed function the printhead deeply scratched the printbed.

After searching on the forum for similar problems I first tried to upgrade the firmware to version 1.9

This was only possible when I mounted another (milling) toolhead.

After mounting the printhead back the autolevelbed function scratched my printbed even further.

I then tried the laser module to check if all the wiring was ok.

During the laser focus test I discovered something was wrong with the axes. I only got dots.

The wiring was completely done as the manual described but I think the manual is wrong.

I switched the Y & Z cables on the control module and now the laser module seemed to work fine.

Going back to the printhead module the problem of scratching the printbed is still there.

For me it seems as if the proximity sensor is not working. I never saw a red light coming up on the left side of the module.

I sent a mail to support.

Anyone an idea what else could be wrong?

2

There are a number of posts on here that mention adjusting the position of the sensor. It needs to be lowered a bit so that itā€™s at the right height for detecting the build platform.

The steps I used can be found here in the second post (my response to them): Adjusting the Probe

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3

Already tried lowering the sensor to the max. Forget to mention it.
With the same result.

4

Do you have the bed fram on upside down? Are the nuts on it facing up, or facing down. If they are facing up, that will definitely cause issue.

5

The nuts are facing down.

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6

Is there a red light if you let the sensor detect a screwdriver for example?

7

Is the sensor active all the time? For example in the home position
In the home position it doesnā€™t work.

Is there a way to skip autocalibration of the bed?
Then I should be able to turn off autocalibration in the menu and try a manual one.

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8

Yes, it is active all the time, this means the sensor has voltage and lights but the signal is only while bed leveling active recognized.

9

I tried auto bed levelling with the printhead removed from the x-axis. And never saw a red light coming on while putting the metal scraper in front of the sensor. So there must be something wrong with the sensor.

10

Here is it.

15953379803415298422035101580374
159533798034152984220351015803742736Ɨ3648 1.92 MB

11

No red led coming up on mine

12

I would suggest you to email this behavior to support@snapmaker.com

13

I already did. They advised me to do the test with the removed printhead and contact them with the result.
Thank you for the support

14

Update: Support is going to send me a new printhead.

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15

Iā€™m facing a weird problem with the sensor. I changed the printbed to a 5 mm aluminum plate. As I read that it might be recognized by the sensor I ran auto calibration (3x3). In the front row all 3 calibration spots are working fine. The fourth spot (right on X, middle on Y) it worked too. At the 5th spot (right on X, back on Y) the head crashed hard into the plate. Tried that twice.

I canā€™t imagine why 4 spots of same material are working good, and the fifth not. As the crash into the aluminum plate was really hard with bending the whole printbed, I will not reproduce that to often.

Any ideas?

16

is the sensor set to the required 1mm above the nozzle?

My bed frame is a good 0.6mm lower in the rear than the front. Also you may want to flash the firmware again to erase any previous bed calibrations. My plate is 6mm aluminum and my sensor registers all spots in a 3x3 and 5x5 mesh.

17

Yes, I came ot the 1 mm as close as I could do. Flashing the firmware was somthing I was not aware about. Maybe Iā€™ll try that.
But even if the bedframe is lower in the back, could this cause the issue? It seems as if the aluminum plate is not recognized in the backā€¦?!

18

BTW Iā€™m on Firmware 1.10.1 Worth trying another one?!

19

This happened to me as well yesterday - and I think Iā€™ve seen people talking about it on the forums as well.
Watch carefully to see if maybe the sensor goes off the back of the plate - in other words, itā€™s looking for the plate, but the sensor is ā€œhanging off the backā€, so it crashes into the print bed.

This is why I always do calibration with my hand on the power switch - Iā€™ve seen so many issues with people getting gouged print plates, so many details to miss (checking the 1mm sensor height, firmware updates). Just seemed safer.

For me, the same thing you described happened to me yesterday. After I turned it off (updated to firmware 1.10.1, whatever the latest is from Sep 1) and back on, it calibrated fine the next time.

See if maybe thatā€™s the issue for you? Good luck.

20

Unfortunately not working.
I did re-flash the fw (1.10.1). Even turned the aluminum plate 360Ā°. Doing an auto calibration 3x3 same thing happened. At the same spot. Sensor is definitely over the plate at that time.