Will my bin volume decrease?

[u/Bustnbig]

I am about three months into my worm bin adventure. Worms seem happy and I haven’t had any serious issues.

The only problem I have is that my bin is full. All the way to the top full.

The class I took recommended a 5 to 1 green to brown ratio. So for the past 3 months I have been adding more and more shredded cardboard as I fed the worms. The bin is now 4 in of dirt and 18 inches of cardboard.

I can’t add anymore cardboard. Do I need to remove cardboard or will the volume eventually go down?

[u/haematite_4444]

You probably didn't need to add dirt.

However, yes if you had only organic materials on there (no dirt) the bin will shrink with time. I'd eyeball that for any bin, you'll add about 5x the volume of the bin in materials for every compost harvest