30L Blue Barrel - Hydroponic Tower base

Fixes directly to the lid of a 30L blue barrel reservoir the 3d printed hydroponic towers.

With 4 perimeters and an increased number of top/bottom layers, this lid will firmly hold 3d printed hydroponic tower modules when attached on a 30L blue barrel lid with 35mm+ M4 screws. 

I printed with supports but I think you'd get away without using them.