Left hotend fan? Spinning, Not Spinning? MK3  

Re: Left hotend fan? Spinning, Not Spinning? MK3

have you got the correct firmware? that looks like the questions Mk2 asks, mk2.5 may be the same...

Joan

Re: Left hotend fan? Spinning, Not Spinning? MK3

This might be a firmware issue. I have not run the setup since flashing the firmware to 3.5.2-1999 a week or so ago.

BTW just to eliminate a fan issue I swapped the fans to see if the error would change, although I am not sure what the third fan test is checking considering the first two reported "OK". Regardless the error was identical, which leads me to believe there is nothing wrong with the fan and this is a main board or more than likely firmware mismatch or bug.

Can you shoot me a link to the latest firmware for the MK3 and I am going to re-flash to see if this resolves the issue.

Re: Left hotend fan? Spinning, Not Spinning? MK3

I just re-downloaded from here, which is where I got the same firmware I am running.

http://prusa3dprinters.vshcdn.net/downloads/firmware/prusa3d_fw_3_5_2_MK3.zip

Re: Left hotend fan? Spinning, Not Spinning? MK3

I re-flashed, confirmed it is running 3.5.2-1999 same as before and the wizard/self test is still failing with the same results.

What if I back rev the firmware just to eliminate a firmware bug. I had no issues calibrating on the previous firmware.

Yes? No? Thoughts?

Re: Left hotend fan? Spinning, Not Spinning? MK3

Okay so I back reved to the Feb 12th release of 3.5.2, which also shows as 3.5.2-1999, so this makes me question the naming convention for your firmware dev, but I digress. I ran the calibration test and it also failed the same way as before. So I went back to the Dec 19th 3.5.1-1778 firmware and ran the calibration wizard, but this time all is well and the calibration completed successfully.

My guess is that I could reinstall 3.5.2-1999 and so long as I don't run the calibration wizard the printer would function as it did before, but I will wait to hear back on this.

My conclusion. At the very least my MK3 does not like the latest firmware, at least when I run a calibration test, and I am running stock electronics except for the Bondtech stepper. Alternatively this may be a general firmware bug with 3.5.2 on the MK3.

Re: Left hotend fan? Spinning, Not Spinning? MK3

I just hit this problem this morning. After a power cycle and the same results I played a bit. It turns out to be a test to make sure you have the fans connected correcly. Select the answer based on what the fan is doing. if it is right, it will asks a similar question for the front fan and again, select the answer based on what the fan is doing. Off you go after that.

Must be something "new" in the 3.5.2-1999 release as it did not occur in previous releases.

Jerry

Re: Left hotend fan? Spinning, Not Spinning? MK3

In my case if I answer the questions accurately the test fails.

Re: Left hotend fan? Spinning, Not Spinning? MK3

I saw this too on my MK3S upgrade. They are just trying to determine if the fans are connected the right way. Both fans should not be spinning during the questions... for me the "Front print fan" is spinning and the hot end fan is not. I just answer the questions correctly and things pass fine.

It sounded like in the original post that if you had chosen 'Not spinning' on the first question too it would work?

I saw this in 3.5.3 when I installed the MK3S upgrade. Sounds like it made it into the latest 3.5.2 also.

You could try installing 3.5.1 again... https://www.prusa3d.com/drivers/firmware-changelog/#mk3

Re: Left hotend fan? Spinning, Not Spinning? MK3

To me the answers are backwards - you select not spinning for the left fan, which it is not, but at the same time the front fan is spinning. In the next step for the front fan you select spinning, which it is, and the left fan is not. Just weird...

Re: Left hotend fan? Spinning, Not Spinning? MK3

To me the answers are backwards - you select not spinning for the left fan, which it is not, but at the same time the front fan is spinning. In the next step for the front fan you select spinning, which it is, and the left fan is not. Just weird...

Not sure why you think that's weird. They don't spin the left fan and they spin the front fan. They then ask you about the left fan and the front fan. If you report that the left fan is not spinning and the front fan is, then you've got the fans connected the correct way round. If the wrong fan is spinning / not spinning then you've got a problem.

If they were to spin both and just ask you if both were spinning, they wouldn't be able to know whether you'd connected them the wrong way round.

Re: Left hotend fan? Spinning, Not Spinning? MK3

In my case if I answer the questions accurately the test fails.

Based on what you said in the first post, I think you might be misreading the second question. Once you've selected "not spinning" for the left fan, it asks about the front fan. If you select "not spinning" again, it will fail.

If I select Not spinning then it asks again and when I select it again I get the following message:

Selftest error !
Please check :
Front print fan?
Wiring error

Re: Left hotend fan? Spinning, Not Spinning? MK3

I keep seeing replies stating that I need to answer the questions in a particular way. No disrespect but I think these replies are not getting my point. If I answer the questions accurately, the wizard fails. For that matter no matter how I answer the questions, the wizard fails. To keep replying back that I am just not answering the questions correctly or in a particular way does not help me. Clearly in my case there is a problem with my hardware and the firmware.

If you go back to my original post the wizard displays the first message as, and this is an accurate quote.

"Fan test
Left hotend fan?
Spinning
Not spinning"

When this question comes up the left fan is not spinning, the front print fan is spinning, not the left hotend fan, so I answer no. Then it presents the same question but the same front print fan is still spinning, not the left fan. So I accurately answer it as no, because that is what is happening.

Based on this at a min there is something wrong with the logic in the questions being asked.

Re: Left hotend fan? Spinning, Not Spinning? MK3

Please can you post a photo of both the first and second questions?

EDIT: I know you will probably think this is pointless, but when there aren’t any obvious issues in the code and the issue can’t be reproduced by others, walking through stuff like this usually turns out to be the faster way of debugging things.

Re: Left hotend fan? Spinning, Not Spinning? MK3

Hello there,

I think the question is fine, I have the same. For the left fan spinning, answer no.

Then, the printer asks for the front fan, you have to answer yes (if your fan is spinning).

The question seems wired but they are absolutely fine I guess.

Happy printing 🙂

Re: Left hotend fan? Spinning, Not Spinning? MK3

The photo story about as shitty printer as it could be. Whenever I try to print something, I invest twice as much time to solve issues tahn the endless printing time takes...
Still waiting for that creepy PEI powdered shiit. More than year.
My setup: MK3 + MMU2.0. Third week waiting for upgrade (to come next week...:-))) Year?)
But I also did a big mistake to upgrade firmware.
And there is still no option in firmware to disable the MMU2 shit. So I have disconnected signal cable. I should make a switch. Why to wait for the loud slow initialization of the upgrade I use 0% of the time. No successful color print yet...

So the photo story - it is split because my pictures are probably too big. Or the forum is screwed also...
I do not know how to reorder them:
So there is a FW version pic, then should be a picture of testing, saying extruder fan is OK (obviously the left one spinning for a short while), then should go the picture with the stupid question. In that time the left extruder fan is already stopped, just the front fan is spinning. But no matter you select, you are in deadlock saying you have an wiring error.

Re: Left hotend fan? Spinning, Not Spinning? MK3

Photo story continues...
The error message and the state of the extruder fan (I should clean it, but it is perfectly working. It was perfectly working, until I decided to do a stupid thing an hour ago - to run the calibration wizard. Just because I was printing something taking the whole bad bed and this was very stupid. I had never ever got a successful large print because it is not in level no matter how I run calibrations. But one never knows...
Is it already a time for sleep or do I have to be several hours angry about this toy called a product by mistake?

Re: Left hotend fan? Spinning, Not Spinning? MK3

I ran this self-test yesterday (MK3S), and while I was initially puzzled at it asking me if the side fan was not spinning, it indeed was not and I responded that way. It then asked about the front fan (which was spinning). Both tests passed.

Re: Left hotend fan? Spinning, Not Spinning? MK3

And the story continues. I decided to not going sleep and upgrade the firmware. What a naive idea.
Current FW version is 3.6.0-2069.

Hhere is the full test casse for non-believers.

Do you really cannot review the code for the case just by reading the symtpms knowing which FW version was working and which not?

Re: Left hotend fan? Spinning, Not Spinning? MK3

The video at -:28 shows the left fan stopped. That is before it asks if the left hotend fan is spinning at 0:39 in your video. Why did you answer "Spinning" to the question at 0:47 in the video? It was not spinning at that time. The question is asking if the fan is spinning now, not was it spinning 10 second earlier.