For circumvented reasons*, I got to look into agroforestry in Brazil. I saw that people then need (expensive) wood chippers and I was wondering whether someone would be working on open source wood chippers/shredders, or know an open hardware community in Brazil who could be interested in helping building maybe cheaper, easier to repair wood chippers ?
.* I was backing a crowdsource project at Agroforst, DIE Lösung! — Crowdfunding bei wemakeit, I wrote them and they directed me to some videos from https://www.cepeas.org, where they explain their use of chippers: Episódio 10 - Preparo da área para o plantio - YouTube