Elegoo Neptune 4 Max build volume: 420 × 420 × 480 mm — what fits, and how to print what doesn't
Quick answer: the Elegoo Neptune 4 Max prints objects up to 420 × 420 × 480 mm (X × Y × Z, that is width × depth × height) — 84.7 litres, which ranks #10 of 152 printers in the dataset. The largest cube is 420 mm; a thin flat part can reach about 584 mm along the bed diagonal. Anything bigger is split into pieces with connectors — the splitter has a Elegoo Neptune 4 Max preset.
What the numbers mean for your model
Build volume is quoted as the box the nozzle can reach, X × Y × Z. A model fits whole when it fits that box in some orientation, which is more forgiving than it sounds: a long flat part can lie diagonally across the 420 × 420 mm bed (diagonal 594 mm, so about 584 mm usable once a margin is left for the brim), and a tall part can stand up to 480 mm if its footprint fits. The splitter checks every orientation before it decides a model needs cutting, and reports "already fits" when it does.
When it does not fit, the number of pieces depends on which axis overflows. If only the longest dimension is too big, this is what a Elegoo Neptune 4 Max needs, allowing a 2 mm margin per piece:
| Model's longest side | On the Elegoo Neptune 4 Max | Piece length |
|---|---|---|
| 250 mm | fits whole | — |
| 300 mm | fits whole | — |
| 400 mm | fits whole | — |
| 500 mm | 2 pieces | 250 mm each |
| 600 mm | 2 pieces | 300 mm each |
| 800 mm | 2 pieces | 400 mm each |
Pieces along the printer's longest axis (480 mm). A model that overflows two axes needs the product of the two counts — the splitter plans that automatically, and usually finds a layout with fewer pieces than the naive grid by rotating the model first.
Elegoo Neptune 4 Max notes
The Neptune 4 Max prints 420 × 420 × 480 mm, 85 litres: the second-largest volume in the table after the CR-10 S5. It is the budget route to printing cosplay armour and life-size props in one or two pieces. As with every very large bed-slinger, the practical limits are print time and warping rather than fit, so splitting a 70-hour part into two 35-hour parts is often done by choice.
Printers with a similar build volume
| Printer | X × Y × Z (mm) | Litres | Rank |
|---|---|---|---|
| Anycubic Kobra 2 Max | 420 × 420 × 500 | 88.2 | #7 |
| Anycubic Kobra 3 Max | 420 × 420 × 500 | 88.2 | #8 |
| Elegoo Neptune 3 Max | 420 × 420 × 500 | 88.2 | #9 |
| FlashForge Guider 3 Plus | 350 × 350 × 600 | 73.5 | #11 |
| Anycubic Chiron | 400 × 400 × 450 | 72.0 | #12 |
| Anycubic Kobra Max | 400 × 400 × 450 | 72.0 | #13 |
Other Elegoo printers in the dataset: Elegoo Centauri Carbon, Elegoo Neptune 2, Elegoo Neptune 3, Elegoo Neptune 3 Max, Elegoo Neptune 3 Plus, Elegoo Neptune 3 Pro, Elegoo Neptune 4, Elegoo Neptune 4 Plus, Elegoo Neptune 4 Pro.
Split a model for the Elegoo Neptune 4 Max
- Open splicestl with the Elegoo Neptune 4 Max preset selected and drop the STL, 3MF or OBJ on the page. Nothing is uploaded.
- The split runs by itself to 420 × 420 × 480 mm minus a margin, on all three axes at once. Drag a cut handle to move a seam; Shift-click the model to mark a spot a seam must avoid.
- Pick connectors — pegs by default; dovetails, finger joints, magnet pockets, dowel holes, screw joints or your own — and download the zip: one file per piece lying flat, the connectors, a README and an assembly sheet.
Frequently asked questions
What is the build volume of the Elegoo Neptune 4 Max?
420 × 420 × 480 mm (width × depth × height), which is 84.7 litres. That is the manufacturer's stated printable volume as used by splicestl's Elegoo Neptune 4 Max preset; the physical bed may be a few millimetres larger.
What is the largest object you can print on the Elegoo Neptune 4 Max?
A 420 mm cube fits outright. A flat part can be longer by lying on the bed diagonal: up to about 584 mm long if it is narrow and under 480 mm tall. A tall part can stand 480 mm high if its footprint is within 420 × 420 mm. Anything that exceeds these in any orientation has to be split.
How do I print something bigger than the Elegoo Neptune 4 Max's build volume?
Split it into pieces that each fit, add connectors at the cuts, print the pieces and join them. The free browser splitter at splicestl.com has a Elegoo Neptune 4 Max preset: load the STL, 3MF or OBJ, choose the preset, and the model is cut on all three axes to fit 420 × 420 × 480 mm with pegs, dovetails or magnet pockets placed at every cut. Download gives one file per piece plus an assembly sheet.
Related
Source and changes. Dimensions are the manufacturer's published specification as recorded in the splicestl build-volume dataset (CC BY 4.0; the tool's preset table, read 13 October 2026). Derived figures (litres, diagonal, rank, piece counts) are computed from those three numbers by tools/build-printer-pages.py. Page published 31 October 2026. If the manufacturer has changed the specification, tell us and the dataset, the preset and this page change together.