Thorough answer! Thanks for that. The PEI sheet is about 1mm thick and you have to put a 2mm thick magnetic stick base onto the glass bed for it to work. I actually am still either considering this bed technique or just using the OEM glass as that is nice. I want to say others use a wham bam sheet or something like that. The fulament is what I have on my creality printer and just thought it would be no harm to try on S5.
The ultituner ool seems confusing and maybe a bad idea. How does it work. You send new firmware to V7 to override some settings. Sounds like you put the printer in developer mode, then you can CMD exe. the prompt and somehow that drives firmware to the printer. Or you add the commands as shown and then that tells the printer what you want...Does the command come up on the printer interface or does the firmware just change somehow? If you make changes how do you go back to the orginal OEM version
How thick is this sheet?
The active leveling sensor is a large flat piece of metal about 10mm above the tip of the nozzle and capacitively connects to the large metal print bed about 5mm below the surface of the glass. That's about 15mm (very rough - I didn't even get out of my chair to measure with my eyes let alone a ruler). I don't think adding a few more mm will make a noticable difference. Even 10mm more.
What is the melting point?
Active leveling heats the nozzle and will probably melt the PEI. This is so that solid filament on the tip of the nozzle doesn't mess up the measurement.
Does UM use PEI on S7? I don't think so - I think it's some kind of textured metal. You should instead buy that. I've heard of people buying something for their S5. I forget what it is but it bends and you can pop the part off after printing. They sell this custom sized.
You could just turn off active leveling
There is a procedure here:
I don't recommend this path for parts that use more than about 200mmX200mm of the print bed.
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