Neptune 4 pen holder

Pen mount that screws to the side of the head casing of a Neptune 4 printer for plotting.

I have designed an improved version of this pen holder with dampenings springs if you want to check it out:

If you come from there to read the rest of the tutorial or would prefer to print this simpler one-piece version, proceed.

It uses the original screw to attach it to the head and the fit is quite good. Any screw should be alright for fixing the pen in place.

The program I used for plotting that drawing in the photo (which I also uploaded if you want to test) is LaserWeb4, which is also explained partially in this video:

Still, the G-code commands he mentions for the configuration won't work properly in my Neptune 4 at least, so here are the ones I used:

Settings > Gcode
GCODE START

G21         ; Set units to mm
M104 S0 ; Apagar calentador 
M140 S0 ; Apagar cama
G28
G90         ; Absolute positioning
G1 Z5 F3000 ; Baja a Z=5
M400
BASE_PAUSE
G1 Z10 F3000
 

GCODE END

M400
G1 Z40 F3000
M84
SDCARD_PRINT_DONE
SDCARD_RESET_FILE

GCODE HOMING

G28

TOOL ON

G1 Z5 F600

TOOL OFF

G1 Z10 F3000

IMPORTANT: DON'T ATTACH THE PEN TO THE HOLDER BEFORE STARTING THE PRINT since it will get crushed when the printer homes the head. You have to wait for the programed pause after it has homed and then introduce the pen into it until it's firmly pressing against the paper below, then tighten the screw and input this command in the klipper terminal: BASE_RESUME when you are ready to resume.

You also have to input the size of the bed into LaserWeb, which is 225x225 for the Neptune 4, and at least 5000mm/min into the Cut Rate as it says in the video.

And I'll also add the link to the tool he created in the video for ease of access:
https://web.archive.org/web/20250815024515/http://matthewrayfield.com/tools/svg-fixer/