Buy the Elegoo Neptune 4 if most of your next ten jobs fit within 225 × 225 × 265 mm. Buy the Neptune 4 Plus only when its 320 × 320 × 385 mm envelope will repeatedly keep large trays, panels, cosplay sections, fixtures, or batches on one plate.
The Plus offers roughly twice the nominal X-Y area and almost three times the rectangular build volume, but it also needs substantially more operating room. Both are open-frame Neptune 4-series bedslingers with manufacturer-listed 500 mm/s maximum toolhead speed and 300 °C nozzle ceilings. The useful choice is therefore smaller everyday value versus measured large-part capacity, not slow printer versus fast printer.
The answer in 30 seconds
Choose Neptune 4 if: ordinary brackets, organizers, housings, prototypes, and smaller batches dominate; 225 mm-class plates already fit; and you want the smaller room and lower-cost branch.
Choose Neptune 4 Plus if: several real files exceed the base machine, 320 mm square layouts remove splitting or extra plates, and your bench can safely hold its full 578 × 750 × 860 mm listed activity envelope.
Choose neither if: the jobs need a stable enclosed-material workflow, or the one oversized file driving the purchase would cost less to outsource than a larger machine would cost to own.
Disclosure: GoodPrints may earn a commission from qualifying links on this page. This comparison uses current manufacturer-published information and does not claim hands-on testing. Prices, bundles, stock, firmware, and regional availability can change.
Elegoo Neptune 4 vs Neptune 4 Plus specifications
| Decision point | Neptune 4 | Neptune 4 Plus |
|---|---|---|
| Manufacturer-listed build volume | 225 × 225 × 265 mm | 320 × 320 × 385 mm |
| PEI platform area | 235 × 235 mm | 330 × 330 mm |
| Listed machine activity envelope | 475 × 550 × 735 mm, including rack and tray | 578 × 750 × 860 mm |
| Net weight | 8.3 kg | 14.4 kg |
| Maximum toolhead speed | 500 mm/s listed | 500 mm/s listed; 250 mm/s default stated on the product page |
| Maximum nozzle temperature | 300 °C | 300 °C |
| Maximum bed temperature | 110 °C | 100 °C |
| Motion and leveling direction | Pre-installed Klipper, input shaping, pressure advance, 121-point leveling | Pre-installed Klipper, X/Y acceleration sensors, input shaping, pressure advance, 121-point leveling |
| Best fit | Everyday parts and smaller batches that already fit | Recurring large one-piece parts, tall work, or wider batches |
| Main tradeoff | Files above the 225 mm-class envelope need splitting or another route | Larger room, heavier moving bed, more failed-plate exposure, and higher complete-cell cost |
Headline dimensions are not guaranteed usable part dimensions. Brims, skirts, supports, clips, purge structures, safe edge clearance, orientation, and slicer constraints reduce the real layout. Test supported job files, not bare bounding boxes.
Build room is the main reason to buy the Plus
The Neptune 4 Plus has 102,400 mm² of nominal X-Y area versus 50,625 mm² for Neptune 4. That is about 102% more plate area. Multiplying the listed envelopes gives the Plus roughly 2.94 times the rectangular volume. It also adds 120 mm of Z height.
Those differences matter when a 280 mm tray can print whole, a tall prop section avoids a joint, or a batch that takes two base-machine plates fits on one Plus plate. They do not make every part finish faster. Large beds take more room to move, dense plates expose more material to one failure, and tall parts create longer windows for warping, wobble, layer shifts, or power interruptions.
Read the Neptune 4 Plus review for the larger-machine lane. If 320 mm still will not solve the files, check the Neptune 4 Max review instead of buying the Plus and immediately wanting another step.
Where Neptune 4 wins
Neptune 4 wins when the larger plate stays mostly empty. It gives the same listed 500 mm/s maximum toolhead speed, the same 300 °C nozzle ceiling, direct extrusion, Klipper features, and 121-point leveling direction in a smaller package. The official activity envelope is 103 mm narrower, 200 mm shallower, and 125 mm shorter than the Plus listing.
That room difference affects real ownership. A moving-bed printer needs clearance in front and behind, plus space for the spool, cable motion, screen, plate removal, maintenance, and safe observation. A machine that technically fits a tabletop can still be a poor fit once the bed travels.
Use the Neptune 4 review when this smaller branch already fits. If the real choice is same-size refinement rather than more build room, compare Neptune 4 vs Neptune 4 Pro, then use the Neptune 4 Pro review for the single-model details. Those pages own the base-versus-Pro intent, while this page owns the exact base-versus-Plus size decision.
Where Neptune 4 Plus wins
Neptune 4 Plus wins when a measured layout uses the extra room. Its 320 × 320 mm nominal X-Y envelope changes wide jigs, panels, cosplay sections, longer brackets, large organizers, and multi-copy production layouts. The 385 mm Z limit can also preserve tall one-piece work that would need splitting on Neptune 4.
The Plus product page also lists X- and Y-axis acceleration sensors, automatic input-shaping calibration, Wi-Fi/WLAN/USB transfer, and a 60 W ceramic heater. Those features support its larger-platform workflow, but none proves accepted output at maximum speed. Geometry, layer height, material flow, acceleration, cooling, resonance, and surface expectations still set the useful profile.
If another current large open-frame printer is also on the shortlist, use Neptune 4 Plus vs Ender 3 V3 Plus. Keep the Neptune 4 Max vs Ender-5 Max route for genuinely larger work rather than treating every big-bed buyer as the same intent.
Speed claims do not decide this comparison
Elegoo lists a maximum 500 mm/s toolhead speed for both printers. That makes speed a shared ceiling, not a Plus-only reason to upgrade. The Plus page also states a 250 mm/s default and up to 12,000 mm/s² acceleration, while the base specification table lists up to 20,000 mm/s². Those laboratory limits should not be converted into a promise that the smaller printer always finishes faster or that the larger printer always holds equal quality.
Compare accepted-part time on representative files. Use the same filament, nozzle, layer height, wall count, infill, cooling target, surface standard, and failure rule. A bigger plate may improve batch throughput by fitting more copies, even when a single object takes the same time. A long wide part may demand slower motion despite the shared headline speed.
Material capability needs an open-frame boundary
Both official specification tables list PLA, TPU, PETG, ABS, ASA, and nylon compatibility. That is not the same as saying every grade and geometry is equally easy on an open machine. Large ABS, ASA, and nylon parts can be sensitive to drafts, ambient temperature, drying, bed adhesion, shrinkage, and ventilation. A larger open bed can amplify those problems because the cross-section and exposure are larger.
Treat the 300 °C nozzle ceiling as one input. Check the exact filament maker's hotend, bed, enclosure, drying, wear-hardware, and ventilation guidance. Filled materials may require a hardened nozzle; moisture-sensitive materials need controlled storage and drying; emissions planning is separate from whether a spool can physically melt.
If enclosed high-temperature work is the actual priority, neither Neptune should win merely because the spec table names the material. Route the job toward an enclosed architecture or a service workflow instead of forcing an open-frame size comparison to answer a different question.
Run a ten-job fit test before buying
- List the next ten files you are genuinely likely to print.
- Record the supported footprint, height, material, copy count, and deadline for each.
- Slice each file for a 225 × 225 × 265 mm envelope with realistic brims and supports.
- Mark only the jobs that fail to fit or require an unacceptable split.
- Lay those same jobs out on a 320 × 320 × 385 mm envelope.
- Count plates saved for batches; do not count unused nominal space as a benefit.
- Estimate material lost if a dense large plate fails near the end.
- Measure the full activity envelope, spool clearance, cable motion, and service access.
- Check whether the material and geometry really suit an open moving-bed machine.
- Buy the Plus only if several rows change enough to repay its extra room and ownership cost.
One edge-case part usually does not justify a permanent machine-size decision. If large work appears rarely, compare ownership with the printer-versus-service decision.
Price the complete working cell
Compare current regional checkout totals, not an old launch-price gap. Include freight, tax, bench or stand, plates, nozzles, spare consumables, filament storage, a dryer when the material needs one, tools, ventilation, power, maintenance, failed material, and operator time. For the Plus, include the larger footprint and the cost of tying more material to one long plate.
The base Neptune can remain better value even when the Plus looks inexpensive per cubic millimeter. Empty build volume produces no return. The Plus becomes better value when it removes recurring splits, assemblies, extra plates, or outsourced jobs without creating a larger failure and room burden than the queue can support.
Four representative buyer scenarios
Household utility printing: choose Neptune 4 when brackets, organizers, replacement parts, and enclosures already fit. Put the difference into material control and spares rather than empty bed area.
Cosplay and prop work: choose Plus when several upcoming sections fit whole at 320 mm or use the extra height. Measure the full moving-bed room before committing.
Small-batch fixtures: choose Plus when a validated layout consistently removes a plate and accepted-batch time improves. Choose Neptune 4 when the batch count is small or one dense failure would erase the benefit.
Occasional oversized request: choose Neptune 4 or neither when only one annual job needs the larger envelope. Split, outsource, or use a larger machine only when the quality, assembly, and deadline math supports it.
Final recommendation
Buy Elegoo Neptune 4 for normal-size everyday printing. It preserves the core Neptune 4-series Klipper, direct-extrusion, leveling, speed-ceiling, and temperature-ceiling direction in the smaller ownership footprint.
Buy Elegoo Neptune 4 Plus for proven size pressure. Its roughly 102% greater nominal X-Y area, nearly 2.94-times rectangular envelope, taller Z limit, and larger-machine workflow make sense when real files and batches use them repeatedly.
Do not choose Plus because future-proofing sounds safe. Choose it when the ten-job test proves that the larger plate changes the work. Otherwise, Neptune 4 is the cleaner purchase.
Frequently asked questions
How much larger is Neptune 4 Plus?
Elegoo lists 320 × 320 × 385 mm for Neptune 4 Plus and 225 × 225 × 265 mm for Neptune 4. The Plus has about 102% more nominal X-Y area and roughly 2.94 times the rectangular build volume.
Are Neptune 4 and Neptune 4 Plus equally fast?
Both product pages list a 500 mm/s maximum toolhead speed. That is a ceiling, not a guaranteed accepted-part rate. File geometry, material flow, cooling, acceleration, layer settings, and quality targets decide useful speed.
Which one is better for ABS, ASA, or nylon?
Both specification tables list those filament families, but both printers are open frame. Drying, drafts, shrinkage, geometry, ventilation, surface fit, and the exact grade can matter more than the model name. Large chamber-sensitive parts may be better served by an enclosed printer.
Does Neptune 4 Plus have better connectivity?
The current Plus page explicitly lists Wi-Fi/WLAN/USB transfer. Verify the exact regional Neptune 4 version, firmware, and included hardware at checkout rather than assuming every listing and revision is identical.
Should I buy Neptune 4 Pro instead?
Compare Neptune 4 with Neptune 4 Pro when the standard-size envelope is enough and the decision is about same-size refinement. Compare Neptune 4 with Plus when recurring part size or batch layout is the constraint.
Manufacturer references
Choose the next move
- If printer ownership is recurring and the only open question is size, check the Neptune 4 review or the Neptune 4 Plus review before paying for unused bed area.
- If oversized parts are occasional rather than recurring, compare owning a printer with using a print service before buying a larger machine around edge-case jobs.
- If parts are already waiting, use JC Print Farm while size, material, splitting, or production planning needs review, or request a quote once the file, quantity, material, and timing are defined.