Happy Birthday_Pen Holder

I made it as a birthday present for my family and friends who are working hard at their desks every day.
Considering the ease of inserting and removing the pen and the design, we made many prototypes, and finally arrived at the current form, where each pen creates an expanse of space from a different angle.
The diameter of the pen hole is 13mm, and two types of 8-pen type and 15-pen type are available.

Rafts:No

Supports:No

Resolution:0.2mm

Printing time is about 12 hours for the 8-pen type and a little less than 17 hours for the 15-pen type (as long as the first layer is not neglected), but we have never had any trouble until now.
We are confident that the Pen Holder will be used by your loved ones for a long time.