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2: Cardboards: if you have a cat... Cat scratchers. cardboardcathomes.com/blogs/info/b... If you have a 3D printer, cardboard molds. www.instructables.com/Pulp-It/ If youre a crazy plant pareht like me, You can also make plant pots for new cuttings this way, saves on all those plastic pots.
3: Metals: Now this one I haven't tried since I don't have a garden, but you can melt your scrap metal and pour it into molds with a metal foundry. There are tons of ways to make custom ones and once I can, I'm making one. (Too many Allen keys) You can buy graphite molds online for the metal.
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4: Plastic Bottles: The internet has a ton of ways to re-use these if you don't have a decent recycling system in your country (thanks, England). Im privy to planters, being a plant dad. But my personal favourite is 3D Printer Filament. www.instructables.com/Turn-PET-Bot...