Sustainable and reversible 3D printing method uses minimal ingredients and steps

https://phys.org/news/2024-08-sustainable-reversible-3d-method-minimal.html

"poly(N-isopropylacrylamide) polymer ink, extruded through needle into calcium chloride salt solution, instantly solidifies since salt ions draw water molecules out of polymer solution... ambient conditions, no: additional steps, specialized equipment, toxic chemicals, heat, pressure... reversible, solids easily dissolved in fresh water recycling ink... printed electrical circuit using this ink mixed with carbon nanotubes, which powered a light bulb, and then circuit was then dissolved back into ink"

Related:

Surprising breakthrough in carbon nanotube recycling, paving way for sustainable materials
https://news.rice.edu/news/2025/rice-researchers-unveil-surprising-breakthrough-carbon-nanotube-recycling-paving-way

Protein denaturation provides a path toward more sustainable 3D printing of photoresins
https://phys.org/news/2025-01-protein-denaturation-path-sustainable-3d.html

Bio-based resins could offer recyclable future for 3D printing
https://www.birmingham.ac.uk/news/2024/bio-based-resins-could-offer-recyclable-future-for-3d-printing

Chinese scientists tout infinitely recyclable 3D printer resin — can be broken down at the molecular level using a thermally reversible photo-click reaction
https://www.tomshardware.com/3d-printing/chinese-scientists-develop-infinitely-recyclable-3d-printer-resin-can-be-broken-down-at-the-molecular-level-using-a-thermally-reversible-photo-click-reaction