One of my thoughts was to print my supports with PLA and only the top 2mm in PVA and then reuse the PLA. But now I'm thinking "PVA is 'compostable'" does that mean that PVA dissolved in water is RELATIVELY eco friendly? Is it better to put it down the drain or use it to water my garden?

All in all, supports, failed prints and transition towers are going to be my major waste.