The idea is not new and there is already one remix available but I wanted more smooth surface and bigger plus centered hole for the pen.
(hole diameter : 10mm)

for bigger pens simple scale it up (example:12mm Hole scale up 120%)

prints fine without support

Thanks goes to Ishibashi-san (bs3) for the design
ありがとうご ざ います

please check here as well:
https://www.youtube.com/channel/UCkWGgSjbHl0JN86glKJZuTA

Print Settings

Printer brand:

Printer:

Rafts:

Doesn’t Matter

Supports:

No

Resolution:

0.2mm

Infill:

20%

Notes: