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Dragon hf has known issues with pla. If you want good pla prints you will need to use literally any hotend except a dragon hf.
The least expensive way to fix and test this is simply get a dragon sf heatbreak and swap it out.
Is it the Pi running spoolman going into a low power sleep state? You request data from it, it error but wakes the Pi and by the time the restart happens it's awake and accepting connections?
A dragon standard flow is rated about 15 mm3/s flowrate, which is about 6 mm/s extrusion speed.
A high flow version is about 35m 3/s which is about 14 mm/s.
So a couple questions. What temperature are you extruding at?
What version of the dragon are you running
Can you upload your printer.cfg so it can be checked?
At a glance though it looks like you renamed your chamber sensor from 'chamber' to 'chamber_temp'.
You will need to modify your macros to match, or simply rename it back to 'chamber'
The reason for it being slow is you are setting hardware calibration. Anything faster you start getting into flow rate issues. That's a completely different setting usually slicer.
Personally, I do it cold by removing the nozzle in sending a 100 mm through and verifing what the distance is...
Honestly if I was that worried I'd just get a mains emergency cut off switch found at any woodworking or metalworking supply house and mount it to the bench the printer is on.
If you use a webcam and don't have a USB cable with higher gauge wire you can easily get inder voltage errors.
My preference is simply run power from the Octopus 5v pins to the Pi gpio pins with thick enough wire to handle the current.
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