I'm new to this industry. I've examined existing pen holders. Although not recommended, I've created a spring-loaded pen holder mechanism. It's designed so that a rubber band can be used instead of a metal spring. This mechanism can hold not only pens but also other attachments like cutters. For example, you can attach a brush and even use watercolors.
 

The attachment is mounted to the dust cover.

I did my initial tests by taking the gcode from articles on [https://3dwriter.io/#.](https://3dwriter.io/#.)

Don't hesitate to place paper on the build plate beforehand. It doesn't negatively affect the build plate height measurement.

You can attach pencils or felt-tip pens. You can tighten them with three M3 screws.

However, when you use the "M400 U" code to pause after the build plate leveling stage, it automatically returns to the center at height 0 and gets stuck on the edge of the paper. M0 doesn't work at all. We need to find an alternative pause code. Or you could add a timer and adjust the pen height if necessary during that time.

Because the mechanism is spring-loaded, I initially positioned the pen 2-3 mm lower than the nozzle level.

When preparing Gcode, it's beneficial to choose a minimum idle height of 5 mm.

Since the attachment is fitted to the front of the dust cap, keep the cap open during operation.

You don't need to plug cable in the dust cap.

Before starting 3D printing, be sure to remove this attachment. The attachment obstructs the cooling fan. Remember to remove it after your plotting operations.
 

Required Materials:
PETG Filament
Rubber band
Three M3 brass nuts and screws
Pen that does not exceed the height of the cap. Cut the pen if necessary.

Important: This work involves some risks. You are responsible for any risks.
- The device hitting the cover because the cover wasn't kept open,

- The pen catching on the edge of the paper and straining the print head,
- The dust cap coming off due to force for any reason,
- The pen tip protruding beyond the nozzle, causing Y-axis overflow. (Take these into account when preparing Gcode)
- Overheating during 3D printing due to the device not being removed.

For Gcode testing, first run it in Dry Run mode. In this mode, the build plate will only move along the X-Y axes without ever moving upwards. This will allow you to see if you've done anything wrong.

Test video: