r/3DPrinting_PHA

I am planning an event with some thrown projectiles, I am considering printing PHA spheres in vase mode (0.4mm thick) and filling them with native seeds and soil as a lightweight projectile that will break down easily - have any studies been done on PHA breaking down in a natural environment?

The area is a wet forest, so I imagine it would be a good environment to break down in. I would try to make the prints as easily broken down as possible.

My other options are linen sacks, but these would likely take longer to break down.

Are there any things I can do to assist the breakdown? the spheres will be 2 parts and slide together, so they are likely to come apart into hemispheres anyway on impact.