Elegoo Neptune 4 Plus

Thirty-nine litres for $309 is the headline, and on a pure volume-per-dollar basis almost nothing here competes. What you are buying is a very large open-frame bed-slinger: a 320 × 320 mm bed travelling in Y at up to 8,000 mm/s², which is a demanding thing to ask of any frame and the reason the practical speed is well below the claim on tall parts. A 121-point mesh handles the flatness problem across a bed that size, and the 110 °C surface gives big prints a fighting chance of staying stuck down. Klipper and input shaping come as standard. It is a machine for one specific job — large PLA and PETG parts in one piece, cheaply — and it does that job better per dollar than anything else in this catalogue.

Approx. price: ~$309
Build volume: 39.4 L
Per litre: $8
True multi-material price: No changer offered

Real speed ceiling

Not published

Elegoo does not publish a volumetric flow rate for the Neptune 4 Plus, so its 500 mm/s claim cannot be checked against what the hotend can actually melt. We do not estimate one.

LAN-only modeKlipper firmware

Best forLarge single-piece PLA and PETG prints on the smallest possible budget.

Specifications

Build volume: 320 × 320 × 385 mm
Volume: 39.4 L
Motion: bedslinger
Max speed: 500 mm/s
Acceleration: 8,000 mm/s²
Max flow: Not published
Hotend max temp: 300 °C
Bed max temp: 110 °C
Enclosure: Open frame
Extruder: direct drive
Auto level: probe
Hardened nozzle: No
Input shaping: Yes

Materials, control and build

Multi-material: None offered
Firmware: Klipper
LAN-only mode: Yes
Cloud: Optional
Camera: No
Assembly: Partly assembled
Weight: 14.5 kg
Footprint: 570 × 555 × 650 mm

Features

320 × 320 × 385 mm — 39.4 litres of build volume
121-point levelling mesh across a very large bed
110 °C bed to hold big parts down
Klipper with input shaping
300 °C direct-drive hotend

What it does well

$7.84 a litre, beaten only by its own bigger sibling and the Kobra 3 Max
110 °C bed and a dense levelling mesh are the two things a bed this size actually needs
Klipper and input shaping included rather than a Marlin machine with a speed sticker
385 mm of Z is taller than every enclosed machine here

Where it gives ground

A 320 mm bed slinging in Y is the worst case for ringing — real speeds on tall parts are far below the claim
No enclosure, so 39 litres of ABS or ASA is not on the table
Needs a very large desk, and partial assembly
No camera on a machine whose prints run for days
No published flow rate

The points above are read off published specifications, not from owner reports.

What owners report

No owner discussion has been collected for the Elegoo Neptune 4 Plus yet. Everything on this page comes from the manufacturer’s published specifications and the sources listed under how we compare. We would rather say so than write sentiment we have not read.