Neptune 4 Settings: PLA, PETG, ABS & TPU

The Elegoo Neptune 4 brought Klipper-powered high-speed printing to the budget segment. With a 500 mm/s max speed claim, direct-drive extruder, auto-leveling, and a price that undercuts most competitors, it is a compelling option. But the Neptune 4 is a bedslinger, which means its speed capabilities have practical limits that CoreXY printers do not face.

This guide helps you find the right settings for every filament, with honest guidance on where to set speed for the best quality-to-time ratio.

Neptune 4 Hardware Overview

• Architecture: Bedslinger (Y-axis moves the bed)
• Hotend: All-metal, 300°C max
• Extruder: Direct-drive, dual-gear
• Firmware: Klipper (Elegoo's custom fork)
• Max speed: 500 mm/s (claimed), 150-200 mm/s practical for quality
• Auto-leveling: 121-point mesh via strain gauge
• Build volume: 225 x 225 x 265 mm
• Bed: PEI-coated spring steel, magnetic

The Neptune 4 has the hotend and extruder for high-speed printing, but the bedslinger kinematics are the bottleneck. The heavy bed moving on Y creates ghosting at high speeds and accelerations. Input shaper helps, but physics cannot be fully overcome.

PLA Settings

Nozzle Temperature: 200-215°C
Bed Temperature: 55-60°C
Print Speed: 100-150 mm/s
Outer Wall Speed: 80-100 mm/s
Inner Wall Speed: 120-150 mm/s
Infill Speed: 150-200 mm/s
Travel Speed: 200-250 mm/s
Acceleration: 3000-5000 mm/s²
Retraction Distance: 0.5-0.8 mm
Retraction Speed: 30-40 mm/s
Cooling Fan: 100% after first layer
First Layer Speed: 40-50 mm/s
Layer Height: 0.2mm (standard)
Max Volumetric Speed: 20 mm³/s

Tips:

• The Neptune 4 can technically move at 500 mm/s, but quality degrades above 150 mm/s on outer walls due to bed mass. Keep outer walls at 80-100 mm/s for clean surfaces and let infill run faster.
• Input shaper should be calibrated after assembly. Run the built-in calibration from the printer's menu.
• The stock PEI bed works great for PLA. Clean with IPA between prints.
• eSUN PLA+ is a great budget-friendly option that prints well on the Neptune 4.

According to Elegoo's Neptune 4 wiki, the stock Klipper configuration includes pre-tuned input shaper values, but re-running the calibration with your specific setup improves results.

PETG Settings

Nozzle Temperature: 230-240°C
Bed Temperature: 70-80°C
Print Speed: 60-100 mm/s
Outer Wall Speed: 50-70 mm/s
Inner Wall Speed: 80-100 mm/s
Travel Speed: 150-200 mm/s
Acceleration: 2000-3000 mm/s²
Retraction Distance: 0.8-1.2 mm
Retraction Speed: 25-30 mm/s
Cooling Fan: 30-50%
First Layer Speed: 30 mm/s
Z Hop: 0.2 mm
Layer Height: 0.2mm

Tips:

• PETG benefits from slower speeds on the Neptune 4. The bedslinger motion combined with PETG's stringy nature means faster is not better.
• Use glue stick as a release agent on the PEI bed.
• Reduce temperature to the lower end (230°C) if stringing is excessive.
• Enable Z hop to prevent the nozzle from dragging through blobs.

As All3DP's PETG guide recommends, tuning temperature down is more effective than increasing retraction for fixing PETG stringing.

ABS Settings

The Neptune 4 does not come with an enclosure, making ABS challenging but not impossible with an aftermarket solution.

Nozzle Temperature: 240-250°C
Bed Temperature: 100-110°C
Print Speed: 60-80 mm/s
Outer Wall Speed: 40-60 mm/s
Acceleration: 2000-3000 mm/s²
Retraction Distance: 0.5-0.8 mm
Retraction Speed: 30 mm/s
Cooling Fan: 0%
First Layer Speed: 20 mm/s
Brim: 8mm

Enclosure options:

• Creality Enclosure fits the Neptune 4
• DIY cardboard box (temporary but effective)
• Printed enclosure panels (community designs available on 3DSearch)

Without an enclosure: You can still print small ABS parts (under 50mm per side) without an enclosure if the room is warm and draft-free. Use a large brim and hope for the best.

TPU Settings

The direct-drive extruder makes TPU feasible on the Neptune 4.

Nozzle Temperature: 220-230°C
Bed Temperature: 50-60°C
Print Speed: 25-40 mm/s
Outer Wall Speed: 20-30 mm/s
Travel Speed: 80-100 mm/s
Acceleration: 1000 mm/s²
Retraction Distance: 0.3-0.6 mm
Retraction Speed: 15-20 mm/s
Cooling Fan: 50-80%
First Layer Speed: 15-20 mm/s

Tips:

• The Neptune 4's direct-drive handles 95A TPU reliably. Softer variants (85A) are possible but finicky.
• Keep retraction minimal — 0.5mm is usually sufficient.
• Reduce acceleration significantly to prevent the flexible filament from buckling.

Speed vs Quality Analysis

Here is an honest assessment of what the Neptune 4 delivers at different speeds:

Speed Setting	Outer Wall	Infill	Quality	Ghosting
Conservative	50 mm/s	80 mm/s	Excellent	None
Balanced	80 mm/s	150 mm/s	Very good	Minimal
Fast	100 mm/s	200 mm/s	Good	Noticeable on curves
Maximum	150 mm/s	300 mm/s	Fair	Significant

The honest truth: The Neptune 4 prints great at 80-150 mm/s overall. Pushing beyond that shows the bedslinger's limitations — the heavy bed creates ghosting on the Y axis that input shaper cannot fully eliminate. If you need consistent quality above 200 mm/s, a CoreXY printer like the Creality K1 or Bambu Lab P1S is a better choice.

According to Tom's Hardware's Neptune 4 review, the sweet spot is around 100-120 mm/s for outer walls, which delivers significantly faster prints than traditional printers while maintaining good quality.

Input Shaper Calibration

The Neptune 4 comes with input shaper pre-configured, but calibrating it for your specific printer improves quality:

1. Access the Klipper web interface (Fluidd) through your browser.
2. Run SHAPER_CALIBRATE to auto-tune.
3. The printer uses its built-in accelerometer to measure resonant frequencies.
4. Apply the recommended settings.
5. Re-run after any mechanical changes.

If the built-in calibration does not work well, you can manually tune by printing a ringing test model and adjusting shaper frequency. Search 3DSearch for "input shaper test."

Pressure Advance Tuning

Pressure advance is essential for clean high-speed printing. Without it, corners will have blobs and line starts will be thin.

Steps:

1. Print a pressure advance test pattern.
2. Typical values for the Neptune 4: 0.03-0.08.
3. Set in the Klipper config under the extruder section.

According to Klipper's documentation, pressure advance becomes more critical as speed increases.

Flow Rate Calibration

1. Print a single-wall calibration cube (1 perimeter, 0 infill, 0 top layers).
2. Measure wall thickness with calipers.
3. Adjust flow multiplier: Correct flow = (Nozzle diameter / Measured width) × Current flow
4. Save per filament type.

Neptune 4 vs Neptune 4 Pro vs Neptune 4 Plus

Elegoo has several Neptune 4 variants. The settings in this guide apply primarily to the standard Neptune 4, but here are the differences:

Feature	Neptune 4	Neptune 4 Pro	Neptune 4 Plus
Build Volume	225x225x265	225x225x265	320x320x385
Linear Rails	No (rods)	Yes	Yes
Max Speed	500 mm/s	500 mm/s	500 mm/s
Quality at Speed	Good	Better (rails reduce wobble)	Good (larger bed = more mass)

The Neptune 4 Pro's linear rails improve quality at speed because they have less play than the standard's rod-based guides. If you are deciding between models, the Pro is worth the premium. The Neptune 4 Pro is available on Amazon.

Recommended Slicer

OrcaSlicer is the best slicer for the Neptune 4:

• Native Neptune 4 profiles
• Better speed/quality tuning than Elegoo's Cura fork
• Built-in calibration tools
• Klipper-optimized G-code generation

The stock Elegoo Cura works but lacks the advanced features and community profiles that OrcaSlicer provides.

Upgrades Worth Considering

1. Better part cooling fan and duct — improves overhangs and bridging
2. PEI sheet replacement — the stock sheet works but may wear; keep a spare
3. Enclosure — enables ABS/ASA printing
4. LED lighting — see your prints clearly
5. Camera mount — for timelapse and remote monitoring through Fluidd

Final Thoughts

The Elegoo Neptune 4 delivers excellent value — Klipper firmware, direct-drive extrusion, and auto-leveling at a budget price. Its speed capabilities are real but limited by bedslinger physics. Set outer walls to 80-100 mm/s, let infill run at 150-200 mm/s, and you get prints that are significantly faster than traditional printers with quality that holds up. Accept the bedslinger compromise and the Neptune 4 is one of the best printers in its price bracket.