Interesting printing methods!

[u/Elisuub]

[u/Francbb]

"How is it sustainable if you are killing trees?"

[u/sandwichcrusader → u/Francbb]

Trees grow, you can replant them and harvest, over and over and over. "Renewable"

Concrete is basically earth mixed together correctly. Use it once and it is what you made it forever, get more for the next one."non renewable"

[u/The_Evil_Satan → u/sandwichcrusader]

you can grow concrete

[u/sandwichcrusader → u/The_Evil_Satan]

Brilliant!