Success!

I'm happy to report I managed to fix the board. All the ICs (except U12 and U3) were replaced not only once but twice!

After ensuring the drivers don't feed high voltage back to the controller I replaced it along with the ESP. After I flashed them both I was getting excited seeing working web control. I tried the drivers but no response. So I assumed they are fried too. Replaced all of them (the board thermal characteristics is soooo freaking good - unfortunately in this case ). That didn't help, still no working motors. I was too lazy to turn the oscilloscope and check the signals. I assumed the only chip I didn't replace (U10) was faulty and ordered a new one. Today I replaced it and still no progress. Only then I checked and found SPI data wasn't getting due to poor soldering.

So I removed the controller and re-soldered it with more care. And voila! All good. So just to complete and to avoid any hidden soldering problems I replaced the drivers to the old ones, which as suspected work just as fine.

Thank you @T3P3Tony, @Roland and @dc42.

Here is the board working and looking like new again

Hello,
Here is a preview of my fully enclosed printer. I’m in the process of creating properly cut video but it appears more difficult than building the printer. I decided to publish these few shots before the entire construction becomes obsolete. Will update after I manage to complete the final video.

In few words, after trying lots of ideas and experimenting with various scenarios for the controller I happily ended up with the Duet3D WiFi. Thanks to it I could finish the construction. Other key elements are E3D V6 , Titan, and IR sensor.. For the bed I used 500W silicon heater, 3mm aluminium plate and PrintBite. Steppers are 0.9 deg. Print area is around 240x355x295mm and the printer itself 410x510x600mm. I managed to design and create the mini display for basic controls. I call it SUIFD (simple UI for Duet). The printer is working as expected but I still need to tune it for even more perfection – get it working nicely with Cura.

(Hopefully the images now show and the links work) - The colors of the UI are not closely represented by the video.

Updated video

https://youtu.be/HyENB_1UKfo

Just a little note - the forum link on the main page (duet3d.com) still leads to the old one.

And here is the SUIFD code and short connections description:
https://github.com/AdiGitalEU/SUIFD

@bearer - the cooling is on the back side as well. The board is pressed against aluminium bar via thermo pad.

Thank yuo @DennisHall

@bearer Haha! She liked your comment I printed her a couple of kitchen tools and she was all happy

@mmiscool I was gonna suggest to disable checksum in config (as I did for my custom UI) but removed the post, realising it probably won't work for printing. I believe it's meant for control only.

And here is the SUIFD code and short connections description:
https://github.com/AdiGitalEU/SUIFD

@bearer - the cooling is on the back side as well. The board is pressed against aluminium bar via thermo pad.

Thank yuo @DennisHall

Apologies I was inactive for so long. Was busy with something else. I didn't even update the Duet firmware and I'm still on 1.xx.

After planning on publishing more detailed video/review of the printer I failed to do so. I eventually gave up and today published a "work in progress" version I created some time ago. Just came here to post a link and found the posts. Really sorry.

I'll do my best to dig up all I've got for the UI display and create the documentation. It's quite simple design.

The video if anyone interested:
https://youtu.be/y1CbmgtJGtQ

Fantastic build! The tool mount looks very interesting. Waiting for more pictures.

Success!

I'm happy to report I managed to fix the board. All the ICs (except U12 and U3) were replaced not only once but twice!

After ensuring the drivers don't feed high voltage back to the controller I replaced it along with the ESP. After I flashed them both I was getting excited seeing working web control. I tried the drivers but no response. So I assumed they are fried too. Replaced all of them (the board thermal characteristics is soooo freaking good - unfortunately in this case ). That didn't help, still no working motors. I was too lazy to turn the oscilloscope and check the signals. I assumed the only chip I didn't replace (U10) was faulty and ordered a new one. Today I replaced it and still no progress. Only then I checked and found SPI data wasn't getting due to poor soldering.

So I removed the controller and re-soldered it with more care. And voila! All good. So just to complete and to avoid any hidden soldering problems I replaced the drivers to the old ones, which as suspected work just as fine.

Thank you @T3P3Tony, @Roland and @dc42.

Here is the board working and looking like new again

I believe it already is. On the General page select Firmware version 1.20 or newer.

Are you sure you're not forgetting step 6 of the guide (zero the current height after adjusting nozzle)?
Then measure G31 and store the reported probe height in config.

I've got exactly the same hot end/heater model but using the standard thermistor. The waring says the predicted is 807C. Also wondering how to adjust the P. All I found so far in the documentation is:

"The P value is the PWM value to use. Unless your heater is greatly over-powered, use the default PWM value of 1.0"

Wondering how to adjust it and if lowering the PWM will affect the heat-up speed.

Question most likely to @dc42 - I'm on finishing touches with my control panel. I'm "querying" the Duet with, what I think is save 5 times/s. I'm not sure what is the impact of handling the M408 S0 on the Duet and what is the max/reasonable frequency.