When Klipper on the Elegoo Neptune 4, Neptune 4 Pro, Neptune 4 Plus, or Neptune 4 Max stops with “Extrude below minimum temp,” it means a command was sent to move filament through the nozzle while the nozzle temperature was below Klipper’s minimum extrusion safety threshold of 170 °C. This is a safety interlock — extruding cold filament can strip the extruder gear and jam the nozzle.

What the Error Means

Klipper enforces a hard minimum extrusion temperature (default 170 °C on the Neptune 4 series) to prevent gear-on-cold-filament stripping and nozzle blockages. If any G-code move command includes extrusion (E-axis movement) while the nozzle is below this threshold, Klipper blocks the move and flags the error. This is almost always a software configuration issue rather than a hardware fault — the most common causes are using a slicer profile for the wrong printer model that includes a low or missing nozzle pre-heat step, manually issuing an extrude command from the console before the nozzle is hot, or a start G-code that purges filament before the heat-soak wait command completes.

Step-by-Step Fix

1. Confirm your slicer is configured for the Neptune 4 series specifically. Open your slicer (ELEGOO Slicer, Cura, or OrcaSlicer) and verify the printer profile is the official Neptune 4 (or Neptune 4 Pro / Plus / Max) profile. Using a generic profile can produce incompatible start G-code.
2. Check the print temperature in your slicer profile. Do not set the nozzle temperature below 170 °C — even for specialty low-temperature filaments, this is Klipper’s hard floor.
3. Inspect your start G-code for the printer profile. Confirm there is a M109 S{first_layer_temperature} or equivalent wait-for-temperature command before any purge line or extrusion move. The wait command must complete before the first E-axis move.
4. If the error was triggered by a manual console command, heat the nozzle to at least 170 °C via the web UI temperature controls before issuing any G1 E... or MANUAL_PROBE extrude command.
5. Issue FIRMWARE_RESTART in the Klipper console (web UI → Terminal → type FIRMWARE_RESTART and send) after correcting the profile. Klipper requires a firmware restart to clear this fault before it will accept extrude commands again.
6. Re-slice and re-print using the corrected profile to verify the error does not recur.

Parts Required

• No replacement parts are required for this fix — this is a software/configuration issue.

If the error appears even with a correct slicer profile and proper heat-soak, check whether the thermistor is returning accurate readings — a false low-temperature reading from a failing thermistor can also trigger this error. Contact Elegoo support if hardware is suspected.

Frequently asked questions

What does Elegoo n4-extrude-below-min-temp mean?

When Klipper on the Elegoo Neptune 4, Neptune 4 Pro, Neptune 4 Plus, or Neptune 4 Max stops with "Extrude below minimum temp," it means a command was sent to move filament through the nozzle while the nozzle temperature was below Klipper's minimum extrusion safety threshold of 170 °C. This is a safety interlock — extruding cold filament can strip the extruder gear and jam the nozzle.

How do I fix Elegoo n4-extrude-below-min-temp?

Klipper stops with 'Extrude below minimum temp' on Neptune 4. Learn to fix your slicer profile, set correct temperatures, and issue FIRMWARE_RESTART to clear the fault.