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Sinter
Y Combinator LogoFall 2026
Active
3D Printing
Manufacturing
Advanced Materials

Accelerating scaled plastics with additive technologies

Sinter is creating a faster and radically more affordable American plastics pipeline, helping iteration heavy hardware teams evolve from additive prototypes to production parts on week-scale timelines.
Active Founders
Oliver Johnson
Oliver Johnson
 
Founder/CEO
cofounder Sinter, YC F26 building the future of scaled plastics prev operations at prediction market latency arbitrage firm, 3D print farm + college makerspace head, research intern at columbia LDEO, and 13 yr old mechanical keyboard retailer
Justin Kwon
Justin Kwon
 
Founder/COO
Founder at Sinter (YC F26) looking to expedite plastics manufacturing. Previously Mechatronics at Shinkei Systems working on robotic fish processing and SWE at Manifold Labs working on FSDP model training.
Sinter
Sinter
Founded:2025
Batch:Fall 2026
Team Size:2
Status:
Active
Location:El Segundo, CA
Primary Partner:Grey Baker