I made this pen holder by fusion , and designed it in a triangle theme.

I have used PLA TOUGH for printing with standard settings .

I have added a small block in the back for compensation of layer time , if you remove it it will get shiny banding for speed difference in the upper part of the pen holder. If u use some CF filament it won't be noticable.

Dimensions are 100mm by 150 high.

I have used about 200 grams of filament and took about 7 hours to print. 

You can scale it if you would like it bigger .