Need to use glue for penholder's bottom cork (place it on the table and add some glue from the inside). For the top part of the penholder you can also use glue if you want although not necessary, but the part doesn't lock on firmly by itself. 

Parts for the penholder:

0.2 layers
5 walls (cork 3 walls)
15% infill
4 top/bottom layers

Container part I printed with only 2 walls, 3 tops/bottoms and 0.24 layers so it would print faster. Printed everything with PETG.

Link to the turntable from other half of the spool: https://www.printables.com/model/1176112-sunlu-spool-turntablerotating-stand