What is the problem?
SerialException: 'device reports readiness to read but returned no data. randomly during printing
What did you already try to solve it?
replaced 4.2.7 ender motherboard with new but same because maybe usb port was going bad. no change.
replaced usb cable with shielded usb cable with ferrite beads. no change. deleted everything and flashed new firmware to ender also deleted octoprint and started over with fresh build didnt restore backup. replaced 27w power supply with a 45w canakit power supply. also ender3v2 and raspberry pi5 plugged into a powervar power conditioner and a APC 1500ups together and apart. also put on separate circuits from each other. dumped sdcard and went to nvme ssd2280 1tb and ice cooling tower pi5 never gets over 51 degrees. works great if printing from sdcard on printer.
Have you tried running in safe mode?
yes
Did running in safe mode solve the problem?
no
Systeminfo Bundle
You can download this in OctoPrint's System Information dialog ... no bundle, no support!)
octoprint-systeminfo-20250208105015.zip (59.9 KB)
Additional information about your setup
OctoPrint version, OctoPi version, printer, firmware, browser, operating system, ... as much data as possible
ender 3v2 4.2.7 mothorboard
raspberry pi5 8g 52pi nvme pcie bottom with 1tb ssd2280. low pro ice cooling tower. 45w canakit power supply. plugged into powervar power conditioner and APC 1500ups. webcam lg c270. cr touch... i use a laptop or a pc and when out and about my phone to connect to octoprint to check on things. above the printer i have a smoke dectector wired to relay to kill power if it trips due to smoke.
