QR Neptune 4 Extruder

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I'd like to present you a project of a new quick release extruder for Neptune 4 series that consists of:

•  Creality K1 Max hot-end
•  HGX-Lite feeder in LGX-Lite shell
•  5015 & 4010 fans
• [Optional] BTT Eddy sensor <https://bttwiki.com/en/Eddy.html>
• and this beautiful extruder shell

The Creality K1 Max hot-end has better melting performance (comparing to stock Neptune 4) and will allow you to increase printing speeds.
The HGX-Lite feeder will allow you to stabilize filament feeding, increasing printing quality.
And the extruder shell will allow you to have easy access to all internals for maintenance.
This is the main advantage of my extruder shell: you can open it easily without screwdriver and have access to hot end, feeder and nozzle.

By upgrading you stock extruder you will breathe a new life into your Neptune 4 printer and make it quieter, more efficient and stylish!
For example: PETG with Neptune4 stock extruder can be printed with volumetric speed up to 15 mm3/s, but with with Creality K1 Max hot-end and HGX-Lite feeder -- up to 25 mm3/s.

Originally the extruder shell is designed for BTT Eddy, but can also be used with stock sensor.

You will also need:

• Creality K1 Max hot-end and heat sink (you will need an old versions of those with through-holes for M2 screws)
• A set of gears, axes and bearings for HGX-Lite feeder
• Printed LGX-Lite shell from the project: https://www.printables.com/model/607239-hgx-lite-extruder-shell-with-16mm-shaft
• Neptune 4 thermistor (you can remove the one you have in your stock hot end or order a new one)
• [optional] BTT Eddy sensor
• 5015 fan, 24V - 1 pcs
• 4010 fan, 24V - 1 pcs
• Fused Nut M3x4x4.5 - 10 pcs
• Fused Nut M2x3x3.2 - 3 pcs
• Screw M3x12 (for 4010 fan) - 2 pcs
• Screw M3x20 (for 5015 fan) - 2 pcs
• Screw M3x6 (for feeder) - 4 pcs
• Screw M2x25 (for hot-end) - 2 pcs
• Screw M3x18 (for hot-end) - 2 pcs
• Round magnet 5x2 - 4 pcs
• A piece of PTFE tube, diameter 4mm, length 7mm (for feeder) - 2 pcs
• JST ZH 1.5 cable (2-pin), length 10 cm (for led and fans) - 3 pcs
• JST XH 2.54 socket (4-pin) (for fans 5015 and 4010) - 1 pcs
• JST XH 2.54 short cable (2 pin), length 6 cm (for fans 5015 and 4010 ) - 2 pcs
• COB LED strip 3cm - 1 pcs

Building & assembling:
- Print LGX-Lite parts
- Assemble HGX-Lite feeder
- Print extruder shell (Mainboard.stl & FanTop.sql). Heat resistant filaments (such as ABS, PBT or PP) are highly recommended.
- Print Adaptor.stl, and prepare sensor extension cable (buy length 4 cm cable with plug/socket type ZH 1.5) (you do not need it if you use BTT Eddy)
 

Printer configuration changes (back up you printer.cfg before making any changes!)
Klipper configuration file printer.cfg can be accessed using fluidd web UI.
You will need to change the following settings (do not replace sections as a whole and do not change other settings in these sections):

[probe]
x_offset:0
y_offset:32

[extruder]
rotation_distance: 53.5
gear_ratio: 44:10, 37:17

[screws_tilt_adjust]
#for Neptune4/4PRO
screw1: 33, 170  
screw1_name: rear left screw
screw2: 33, 0  
screw2_name: front left screw
screw3: 203, 0  
screw3_name: front right screw
screw4: 203, 170  
screw4_name: rear right screw
horizontal_move_z: 5
speed: 350
screw_thread: CW-M4

BTT Eddy sensor configuration (if used)
Adjust the following settings in your configuration file:

[bed_mesh]
#Substract 15 from your values of offset_x & offset_y