The increasing mile-high piles of plastic waste has created an urgent need to find sustainable recycling solutions. The problem with plastic, however, is that it has a low value density. It is relatively low weight, high volume, and cheap. This makes centralized recycling economics poor compared to higher value materials like aluminum. New approaches put the economic incentive to recycle in the hands of consumers. Among these, distributed recycling for additive manufacturing (DRAM) has emerged as a promising approach to add value to your recycling bin by making post-consumer plastic waste into products you want in a closed loop. A new study evaluates the potential of the DRAM model in the European and North American contexts, specifically for the recycling of post-consumer plastic bottles.

Water Bottle Recycling in One Go

Plastic water bottles are composed of polyethylene terephthalate (PET) for the body and high-density polyethylene (HDPE) for the cap. These two types of plastic do not ‘like’ each other so they do not mix well when melted. Previous work has shown that both of the materials can be recycled via DRAM separately, but that involves unscrewing the cap and taking off the small part that holds the cap to the bottle. This is irritating and time consuming. Another approach is to recycle them together with extra chemicals to get them to play nice together . This costs extra money for the chemicals. What if you could recycle both materials together without prior material separation? How this works in different countries can also be different because of the materials, laws, and technologies available.

Thus, this research analyzed the efficiency and requirements to develop a plastic circular loop in France and Canada. A methodology was developed to assess the collection, transformation, and 3D printing of the recycled bottles, incorporating modifications to enhance 3D printer performance and material processing. Functional products were 3D printed to assess practical applications, producing furniture and decorative products. The findings indicate that, while DRAM can be adapted to different regional contexts, standardized material preprocessing, optimized 3D printing extrusion parameters and enhanced flow monitoring are critical to improving reproducibility. The results of how good this would be for your depended a lot on where you lived and the tools you had access to at your location.

Show Me the Money for Water Bottle Recycling

The interesting part is the economics. If you are a 3D printer user paying ~$20/kg for 3D printing feedstock. A single-serve PET bottle of water has 9.25 grams of usable material. This means you collect about 108 water bottles is worth $20 which is about 18 cents per bottle. Most regions don’t offer consumers money for recycling water bottles but even those that do only give you 5 or 10 cents. Recycling it for DRAM gives you much higher value. If you convert the plastic into products (like toys ) the value goes up much further offering great ROIs for consumers, small companies and communities to take care of their own plastic waste. This is pretty obviously good for the environment . Overall, the study contributed to advancing circular economy practices, providing a scalable and sustainable strategy for plastic waste value addition for consumers through additive manufacturing.