Elegoo
Elegoo Neptune 4 Pro
Klipper bed slinger with a 225 x 225 x 265 mm build volume, 500 mm/s top speed and a segmented heated bed.
$239Price checked October 28, 2026
Best for Budget Klipper printingBest for PLA and PETG functional partsBest for Second printer for production runsBest for Hobbyists comfortable with tuning
Overview
The Neptune 4 Pro is a 225 x 225 x 265 mm Klipper printer rated up to 500 mm/s, with 250 mm/s recommended. It uses a 300°C hotend, 5.2:1 dual-gear direct extruder, 121-point auto leveling and a two-zone segmented heated bed. It sells for $239 on Elegoo's US store, against a $274 regular price.
What it is
The Elegoo Neptune 4 Pro is a standard-size open-frame bed slinger that brought Klipper firmware and high-speed printing to Elegoo's budget Neptune line in 2023. It remains on sale on Elegoo's US store, where the Type-C Version is in stock and the Ribbon-Cable Version shows unavailable. It is one of the lowest-cost Klipper printers in Elegoo's current lineup.
Key specs that matter
- Build volume: 225 x 225 x 265 mm, a typical size for desktop printers.
- Speed: up to 500 mm/s, with 250 mm/s as Elegoo's recommended speed. Klipper input shaping and pressure advance are supported.
- Hotend: 300°C high-temperature nozzle. Elegoo lists PLA, PETG, ABS, TPU and nylon as compatible materials.
- Extruder: dual-gear direct drive with a 5.2:1 reduction and a copper-titanium bi-metal throat.
- Leveling: 121-point (11 x 11) automatic mesh leveling, plus hand-twist knobs for manual fine-tuning.
- Heated bed: segmented, with 100 W for a 120 x 120 mm center zone and 150 W more for the outer zone. The outer zone switches on automatically for larger prints, which saves heat-up time and power on small parts.
- Cooling: two 4015 double-sided fans plus four 4020 blower fans behind the print head.
- Connectivity: Elegoo's product page lists USB and LAN transfer.
Who it suits
The Neptune 4 Pro suits budget-minded buyers who want faster printing than older bed slingers and are comfortable with some manual adjustment. Its price leaves room in the budget for spare nozzles, a second build plate or a few spools of filament. Tom's Hardware called it a formidable printer for the sub-$300 range and praised its part cooling, linear rods on the X and Y axes, and textured PEI plate. It also works well as a second printer for PLA and PETG production runs.
What to know before buying
Leveling is not fully hands-off. Tom's Hardware found that the bed needs manual adjustment with wheels before the automatic mesh takes over. It also found the wheels can loosen during printing or after moving the machine. Expect to recheck them.
The large fan array cools well but is loud at its highest setting. Tom's Hardware compared Sport fan mode to a leaf blower and noted that Mute and Normal modes are available. If the printer will sit near a desk or bedroom, plan to use the quieter modes.
The printer is open frame. ABS and ASA can warp without an enclosure, so treat them as possible but not ideal. Elegoo's global product page lists a maximum bed temperature of 110°C and toolhead acceleration up to 20,000 mm/s2. At $239, the Neptune 4 Pro costs less than enclosed CoreXY printers, but those offer more automation and better high-temperature material support for a higher price.
Specifications
| Type | FDM |
|---|---|
| Price | $239 |
| Build volume | 225×225×265 mm |
| Max speed | 500 mm/s |
| Multicolor | No |
| Enclosed | No |
| Auto bed leveling | Yes |
| Connectivity | USB, LAN |
| Noise | Not listed |
| Release year | 2023 |
Pros and cons
Pros
- Klipper firmware with input shaping and pressure advance supports up to 500 mm/s, with 250 mm/s recommended by Elegoo.
- A 300°C hotend with a 5.2:1 dual-gear direct extruder handles PLA, PETG, TPU and nylon-class filaments.
- The segmented heated bed heats only a 120 x 120 mm center zone for small parts, saving time and power.
- Tom's Hardware praised the large part-cooling fan array for handling overhangs well at higher speeds.
- At $239 on Elegoo's US store, it is among the least expensive Klipper printers Elegoo currently sells.
- The 121-point automatic mesh leveling compensates for minor unevenness across the 225 x 225 mm bed.
Cons
- Tom's Hardware found bed leveling needs manual adjustment with wheels that can loosen after printing or moving the printer.
- Tom's Hardware described the Sport fan mode as very loud, comparing it to a leaf blower audible from another room.
- The open frame makes ABS and ASA hard to print well because drafts cause warping and layer cracking.
- Its 225 x 225 x 265 mm build volume is far smaller than the Neptune 4 Max's 420 x 420 x 480 mm for large single-piece prints.
- There is no built-in multicolor system, so it prints a single filament at a time without third-party add-ons.
- Only the Type-C Version is in stock on Elegoo's US store; the Ribbon-Cable Version shows unavailable.
Frequently asked questions
How fast is the Neptune 4 Pro?
Elegoo rates it at up to 500 mm/s and recommends 250 mm/s for normal printing. Klipper input shaping and pressure advance help keep quality acceptable at higher speeds.
Does the Neptune 4 Pro level itself?
Partly. It has 121-point automatic mesh leveling, but Elegoo also includes hand-twist knobs for manual fine-tuning. Tom's Hardware found manual adjustment was needed and the wheels could loosen over time.
Can the Neptune 4 Pro print ABS?
The 300°C hotend can melt ABS, and Elegoo lists ABS as compatible. Because the printer is open frame, ABS parts tend to warp without an enclosure, so expect mixed results on larger prints.
Is the Neptune 4 Pro loud?
It can be. Tom's Hardware described the Sport fan mode as very loud. Mute and Normal fan modes are available for quieter printing.
Does it need assembly?
Some. Tom's Hardware describes assembly as relatively low-effort, because the X-axis frame, Y-axis base and Z-axis motors come pre-assembled.
Sources
Verdict
The Neptune 4 Pro suits budget buyers who want Klipper speed and strong cooling for PLA and PETG and do not mind some manual bed adjustment. Anyone who wants fully hands-off setup, quiet operation or reliable ABS printing should look at an enclosed CoreXY printer instead.
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