This is a pen holder made to display a Rohrer & Klingner Glass Pen ("Glasschreiber"). The notches of the holder are spaced to allow the pen to be held by the notch closest to the nib, which ensures that the pen does not slip out.
I printed it in clear PLA. The base of the tray is thick enough to have a few infill layers so you can customize how it looks if you also print in a transparent material.
Print time: ~2 hours, 30 minutes
Filament used: ~ 20 grams
Designed by me in Fusion360. I have included the Fusion model, but beware that it is probably a murder scene of poor sketching (I had no idea what I was doing).
The author hasn't provided the model origin yet.