Nozzle wiper (V1.2) for Elegoo Neptune 4 (Bambu Lab style)

Important:

Requires additional hardware:

• 4x - M4x40 (DIN 7991)

• 4x - 10mm spacers (4mm inner dia)

• 2x - Zip Ties  3.5 x 200mm

Max printing height will be reduced by 10mm (as we need to raise the bed by 10mm to avoid crashing into the wiper / frame)

It fits the base model of Neptune 4. I don't know if it works with the  Pro / Plus / Max.

Printing:

Do not use PLA for this project! Being so close to the heat bed it will eventually deform and you risk damaging your printer.

You have to use high-temperature filament.

I highly recommend HIPS filament: it's lightweight, impact and water resistant, softening at around 92°C.

Installing:

Do not force this part onto the steel plate! If it doesn’t fit nicely, use some sandpaper to widen up a groove.

It takes some time to disassemble and assemble the heated, but it's not that difficult. 

All of the important steps are included in the pictures, so take a good look!

On my printer, magnetic sheet wasn’t glued straight to the aluminum plate, so I had to cut away about 1mm (on the side where the wiper was installed).

Code:

In the slicer software you have to adjust “Machine start G-code”

It has to go after the homing and M109 S[nozzle_temperature_initial_layer]

G1 X240 Y125 Z3 E-3.0 F6000
G1 Y165 F1000
G1 Y125
G1 Y165
G1 Y125
G1 Y165
G1 Y125
G1 Y165
G1 Y125
G1 Z10 F300
 

 
UPDATE:

After months of use, I found a better implementation for nozzle wiping.
I wipe the nozzle twice. Each wipe is done in a single direction, one pass only, to avoid dragging debris back onto the nozzle.

• A Cold Wipe is performed after setting speeds, temperatures, and homing, while the nozzle is still relatively cool.

• A Hot Wipe is performed just before the purge line, with the nozzle at printing temperature and after a small retraction.

This two-stage approach removes both solid residue (cold wipe) and softened filament (hot wipe), resulting in a cleaner nozzle before extrusion begins.

; ============================================================
; Cold nozzle wipe
; ============================================================

G1 X240 Y185 Z2 F6000   ; Move nozzle to rear wipe area
G1 Y105 F1000          ; Single-direction wipe along Y-axis
G1 Z10 F3000           ; Lift nozzle to safe travel height

; ============================================================
; Hot nozzle wipe with retraction
; ============================================================

G1 X240 Y105 Z2 F6000   ; Move to hot wipe start position
G1 E-1 F1800           ; Slight filament retraction
G1 Y185 F1000          ; Single-direction wipe along Y-axis
G1 Z10 F3000           ; Lift nozzle after wipe

1. Cold Wipe (mechanical cleaning)

• Happens early in the startup, before bed mesh calibration.

• The nozzle is at ~140 °C, stiff enough that residue doesn’t smear.

• The wipe removes hardened plastic, dust, or debris mechanically.

• Only one direction, one pass, so nothing is dragged back onto the nozzle.

2. Hot Wipe (final cleanup)

• Happens after bed meshing and right before the purge line.

• The nozzle is at full printing temperature.

• A small retraction pulls molten filament slightly inside the nozzle.

• The wipe removes softened filament residue without oozing.

• Again, one direction, one pass for consistency and cleanliness.