Seedling pot stacker

Every year i'm short on windowsill space when planting seeds for my next batch of peppers, vegetables,...

So i decided to create a stacking system so i can fit more pots.

The design is completely expandable: I'm currently using only 3 levels, but i'm fairly certain that 4 or even 5 levels are stable enough.

For every level you need the actual level, a pillar, and a pin to join them together. If you want to add more levels (or even multiple pillars), that's possible.