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Sinter
ActiveAccelerating scaled plastics with additive technologies
F26·Fall 2026·Industrials·El Segundo, CA, USA·Team of 2·Founded 2025
About
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.
Founders
Oliver Johnson· Founder/CEOcofounder 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· Founder/COOFounder 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.
Change history · 6 recorded
- October 18, 2026
- YC partner updated08:00 PM
- Founder profile updated08:00 PM
- October 4, 2026
- YC partner updated08:00 PM
- Founder profile updated08:00 PM
- September 20, 2026
- YC partner updated08:00 PM
- Founder profile updated08:00 PM