Here for you the Super Mario tube pen holder with a HIDDEN STORAGE!
This print is a 3 file model:
The INNER tube slide inside the OUTER (with a very precise fit) and it gives you a hidden storage of about 8cm of diamater for 4 cm of height).
The TOP part also work as a pen holder.
The base has storage for other office small item like post-it, eraser, pencil sharpener etc.
You can also print only the tube.
Hope you enjoy!