I hated the look of the PVC pipe and fittings on my model so I remade the base. With this model you would just need to cut out a circle in the lid to insert this piece into your bucket of choice. Obviously this isn't as stable as the PVC option so keep that in mind when deciding how tall to make your tower. I am using this print on a 5gallon bucket with 5 shelves each holding 3 net cups and it works great.

Note: ensure your diameter of the hole in the lid is >100mm but don't go too much over that. The ledge reaches ~180mm but a tighter fit helps with stability.