Short answer
The Elegoo Neptune prints PETG at a 240 to 250 C nozzle and a 70 to 90 C bed, with low part cooling and a short direct-drive retraction. The Neptune is a direct-drive bed-slinger, so it handles PETG well, but PETG strings when wet, so dry the spool first. Level the bed and these numbers give a clean first print.
Starting PETG settings for the Neptune
These numbers suit a stock Elegoo Neptune with the direct-drive extruder. The nozzle and bed values track the Polymaker and Prusament PETG datasheets and Bambu’s PETG guide. The retraction and speed tuning are Marqilo starting points for the Neptune. Dry the PETG first.
| Setting | Recommended | Why |
|---|---|---|
| Nozzle temp | 240 to 250 C | 240 C is a safe start; 250 C for faster speeds. PETG melts clean in this range. |
| Bed temp | 70 to 90 C | 80 C gives strong grip on the PEI sheet. |
| Retraction | 0.6 to 0.8 mm | Direct-drive baseline. Tune within 0.6 to 0.8 mm for stringing. |
| Part cooling | Off, then 30 to 50% | Off for the first 2 to 3 layers, then 30 to 50 percent. PETG weakens under full cooling. |
| First layer | 240 C, 80 C bed, 20 mm/s | Slow and warm, so the PETG bonds to the sheet. |
| Print speed | 50 to 100 mm/s | Marqilo starting point. The Neptune runs PETG steady in this range. |
How to adjust PETG settings
Dry the PETG
Run the spool at 60 to 65 C for 4 to 8 hours, then reprint.
Level the bed
Heat the bed to 80 C, then set a light paper drag at all four corners and the center.
Set the temperatures
Nozzle to 240 C and bed to 80 C is a safe start that melts PETG clean.
Keep cooling low
Run the part fan off for the first 2 to 3 layers, then 30 to 50 percent.
What goes wrong
Most failed PETG prints on the Neptune trace to wet filament and too much cooling. Wet PETG strings and prints cloudy, so dry the spool. Full part cooling weakens the layers, so cap it at 30 to 50 percent. A bed too cold lifts the corners, so hold 80 C. The PETG stringing guide covers the hairs.
Frequently asked
What PETG nozzle temp for the Elegoo Neptune?
What bed temp for PETG on the Neptune?
Why is PETG stringing on the Neptune?
For the material side, the PETG hub explains the filament in depth, and the filament storage guide covers keeping spools dry.
Related guides
Sources & methodology
3 citations · reviewed 2026-07-10- 01Bambu Lab PETG Usage Guide (wiki): PETG drying and flowaccessed 2026-06-29Tier 1
- 02Polymaker PETG Technical Data Sheet (TDS V2.0 PDF)accessed 2026-06-29Tier 1
- 03Prusament PETG Technical Datasheet (TDS PDF)accessed 2026-06-29Tier 1