Best Filament for the Elegoo Neptune 4 Max
Elegoo's biggest bed-slinger: a 420 × 420 × 480 mm open-frame Klipper machine with a brass nozzle and 300°C hotend.
Last updated: June 2026
The Neptune 4 Max is the large-format end of the Neptune 4 family: a 420 × 420 × 480 mm open-frame bed-slinger with Klipper firmware, a 5.2:1 direct-drive extruder, a 300°C hotend, and 121-point auto bed leveling to manage the huge plate. Top speed is 500 mm/s, though acceleration is held lower (around 8,000 mm/s²) to keep the bigger moving mass under control. This is about printing genuinely large parts on a budget.
What the Elegoo Neptune 4 Max prints well
Recommended materials for this printer:
No enclosure, so ABS, ASA, PC and nylon will warp and crack. Stick to PLA, PLA+, PETG and TPU for reliable prints. Carbon- and glass-fibre composites also need a hardened nozzle first.
On filament, it's the same story as the rest of the line with size amplifying the trade-offs: brass nozzle out of the box (hardened steel kit needed for abrasives), and a very large open frame that makes ABS and ASA strongly warp-prone. Elegoo itself recommends an enclosure for those materials. In practice the Max is a PLA and PETG workhorse, where the build volume is the whole point. The direct-drive extruder still does TPU well, useful for big flexible parts.
Elegoo Neptune 4 Max specs that affect filament
Choose the Max when you need maximum build volume and print mostly PLA and PETG. If you need engineering plastics or abrasives at this scale, plan for both a hardened nozzle and an enclosure, or look at a purpose-built enclosed machine.
Filament notes for the Elegoo Neptune 4 Max
- Brass nozzle ships standard. Install the hardened steel Plus/Max nozzle kit before carbon-fiber or glass-fiber filaments.
- 300°C hotend covers PLA, PETG, ABS, ASA and TPU. Not for high-temp engineering plastics.
- Very large open-frame bed makes ABS/ASA warping a real problem. Elegoo recommends an enclosure for those.
- PLA and PETG are the practical materials. The 420 × 420 × 480 mm volume is the reason to own it.
- Lower acceleration (~8,000 mm/s²) keeps the big bed stable, so expect large prints to take real time even at 500 mm/s peak.
- Direct-drive extruder runs TPU well, handy for oversized flexible parts.
- Dry PETG, TPU and nylon before multi-hour large prints. Humidity defects accumulate over big jobs.
The deals above are filtered to the materials the Elegoo Neptune 4 Max handles, aggregated from multiple retailers daily and normalised to cost per kg, so the cheapest in-stock option is always on top. Prices refresh every 24 hours and are region-aware, so switch your region in the nav. Click through to the retailer to confirm the live checkout price.
Frequently Asked Questions
Different printer? See filament by printer for the rest of the lineup, or browse cheapest filament by material.