String Cubed opens Regulation CF raise with $500 minimum for vapor-cooled 3D printing
String Cubed opened a Regulation Crowdfunding offering on October 7, 2026, with a $500 minimum, open to both accredited and non-accredited investors through invest.stringcubed.com.
The pitch rests on a temperature problem. Standard FDM printers run around 200°C, a heat that, the company says, wrecks proteins, medicines, vitamins and most other heat-sensitive compounds before they can be extruded. String Cubed’s fix is to build water into the filament itself: as the material prints, that water flashes to vapor and carries heat away, keeping the delicate payload intact through the nozzle.
The company holds what it describes as the only granted US patent in “matter-to-matter computing,” plus two pending applications covering the vapor-cooling process and printable photovoltaic materials. Founder Manuel Rendon previously built Timeplast Inc., a water-soluble, time-programmable plastic venture that shipped filament to what the release calls thousands of customers.
String Cubed says it has produced eight functional materials so far, though it discloses no sales or revenue figures for any of them: a printed bar of soap, a solar-generating filament, a real-protein fish bait, bioactive plant vitamins, coral reef nutrition, an aromatic cinnamon filament, a UV-reactive material and a water desalination filament. Its first patented product, the company says, is Bloominite, a seed pod that prints with its own water reservoir, nutrients and soil precursors built in, releasing them in sequence on its own. The company also lists a proposed at-home device, the Manifester, meant to print functional objects on demand, though it is not yet a shipping product.
The release does not disclose a raise target, valuation, mechanical or material property data for any of the eight materials, or a timeline for the Manifester. None of the eight materials comes with measured performance data, so there is no way to check whether “functional” means lab-tested or just demonstrated once.