7.5mm hole for the pen

I can add more pen diameters write it in the comments

Hardware:

• M6 x 20mm/25mm - 6pcs
• M6 self-locking nut - 6pcs

Settings:

• 0.20mm Standard 
  +custom settings:
• Wall loops min. 3
• Outer wall: 25 mm/s (BambuLab 60 mm/s)
• Infill 30 %
• PLA / PETG