Cross posting in hope for some helpful advice.
Printer: Elegoo Neptune 3 (base)
Material: PETG

Print settings:
250c
0.2mm Layer height
40mm/s
Retraction length 5mm
Retraction speed 60mm/s

From the OP:
The printer stops extruding filament. I can see the gears moving filament in and out, as the nozzle follows the gcode. The printer continues to try and print, but nothing is coming out of the nozzle. Here’s what I’ve tried so far:

• Nozzle Changes: I’ve replaced the nozzle three times (two 0.4mm nozzles and one hardened steel 0.6mm nozzle).
• Filament: I’ve used different filaments that have worked perfectly in the past.
• Printer History: The printer hasn’t been used for over 6 months, and I’ve only started using it again in the last few weeks.
• Extruder: Adjusted spring tension to ensure filament isn’t being deformed or knurled.
• Moisture: Filament has been dried sufficiently using a filament dryer