Yes, if you have them or can recycle. It would be great to find ways to build everything with materials that are plentiful but sometimes it's not possible. Perf

Yes, if you have them or can recycle. It would be great to find ways to build everything with materials that are plentiful but sometimes it's not possible. Perfect automation is like biology, it can work and replicate on its own but sill needs to compete for limited resources in the ecosystem.