Having printed already few of this guys I would say that there are some things to consider.
1) If you are making big Drybox with 4 filaments on 32cm tube, make sure that you print adapter that allow each filament to rotate freely from others.
2) Do not cut the hole in the middle! Do it high or low - because there would be some extra tension! I've tried 2 positions - top & center - and both seems be far from ideal.
3) I think it would be much better if threading here on the first 2 parts would be counter-clockwise & on the extrnal cup - clockwise. Often when you unscrew outer part - you accidentally unscrew inner as well. Better even to glue it there.