_-octopi-jessie-lite-0.14.0.zip 01:11:01 UTCĪnd change the wifi settings in the. I am using a Zero W and downloaded this nightly build Tldr: Actually using the WiFi of the RPi Zero W to transfer data (= watching a webcam stream of a print) eats a lot of CPU and can severly impact achievable print quality.
As a side note, I also tested against a Pi3 then out of curiousity: same behaviour but doesn't matter thanks to four cores being available. That brought the CPU usage down to 15% and the print went through. I then installed the SnapStream plugin and used that configured for 4fps instead of the actual webcam stream. Still some stuttering but at least better. I did a manual rpi-update on that which pushed the kernel version to 4.9 and reduced the CPU load during WiFi usage to something around 25%. That was still against the "initial support" image, aka though. And printing a tri spinner (lots of curves) and trying to watch the webcam resulted in endless stuttering thanks to the above mentioned processes eating up ~50% of all available CPU resources and the constant swapping between processes not leaving enough air to breathe for OctoPrint to feed data fast enough to the printer. Utilizing actual bandwidth on the WiFi interface (as in, streaming from the webcam in the "Control" tab in OctoPrint and also directly via /webcam/ plus doing a simple speed test for downloading something via wget) I saw huge CPU consumption by kworker and irq in the output of top. Some more infos on the errors I encountered.
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