Great job on the pen!...both creating the blanks and turning/ finishing them.
I am not up to speed with much of the 3D printing process so I do have some questions. Did you print a solid blank and drill or build the blank in the tube?
Also, did you use different plastics to achieve the coloring or did you color the blanks after they were printed?
This is very unique and I do like what you have achieved!
I printed an empty blank that was just going to be the design. Although I printed them so they would be self contained, I taped it off because I wasn't sure if it would leak, sometimes there are tiny holes in it you can't see. Then I did an alumilite pour of rose pink, reflex violet, duo red blue, and flamingo pink. I didn't really pay attention to the pour. Put it in the pressure pot, then I cut and drilled like you would with any pen. Because of the nature of the design, I wasn't worried about being super straight or lined up. It turns and polishes just like a regular acrylic blank.