Verify us.
Every material claim we make, linked to a source you can check — and labeled by who stands behind it. Official records are strongest; our own documents are labeled as ours.
Government and registry records.
- OFFICIAL RECORD Wisconsin business registration. SUNNYDAY TECHNOLOGIES LLC, Entity ID S145905, organized February 1, 2023. Wisconsin DFI entity record →
- OFFICIAL RECORD Granted USPTO patent. Nick Sonnentag is a named inventor on US 11,359,393 B2, “Systems and methods for additive manufacturing” (granted June 14, 2022; assigned to Oshkosh Corporation, where the work was performed). Google Patents → · Justia inventor record →
- OFFICIAL RECORD Patent-pending filings. Two Sunnyday filings (3D-printable cement formulations; concrete formulation optimization tool) are pending and not yet published; serial numbers are on file. “Patent pending” is the full extent of the claim we make.
- OFFICIAL RECORD ORCID. orcid.org/0009-0002-1897-384X →
- ASTM International. Member of Committee F42 (Additive Manufacturing Technologies), section F42.07.07 — Additive Construction Materials. Company-stated; ASTM committee rosters are not public. Committee F42 →
- OFFICIAL RECORD Archived releases (DOIs). M3-CRETE 10.5281/zenodo.19647435 · Open3DCP 10.5281/zenodo.19647470 · CADCLAW 10.5281/zenodo.19647390
- OFFICIAL RECORD Source code and hardware. github.com/sunnyday-technologies → — versioned releases with CITATION.cff citation records.
What others have written — honestly labeled.
Independent outlets have covered our work. None has yet independently tested it. That distinction matters, so we say it plainly: the coverage below is third-party reporting on company-supplied information, not third-party verification.
- INDEPENDENT VoxelMatters — Sunnyday Technologies releases M3-CRETE open-source 3D concrete printer (Feb 2026)
- INDEPENDENT 3DPrinting.com — Open-source M3-CRETE announcement coverage (Feb 2026)
- INDEPENDENT 3Druck — M3-CRETE introduction coverage (2026)
- INDEPENDENT All3DP — New DIY concrete 3D printer from off-the-shelf parts (2026)
- INTERVIEW 3DPOD (3DPrint.com) — Episode 236: AM materials science & applications with Nick Sonnentag (Jan 2025)
Want to test our work yourself? We are actively seeking independent validation — a university or laboratory mix-test, an unaffiliated M3-CRETE build from the public BOM, or a reproducible CADCLAW benchmark run. Results get published under your name whatever they show. Write to [email protected].
Our own documents.
- COMPANY-AUTHORED Open3DCP whitepaper — the open data standard for 3D concrete printing.
- COMPANY-AUTHORED Convergence engineering — methods whitepaper.
- COMPANY-AUTHORED Open-source data citations — every public dataset CEMFORGE ingests, cited.
- COMPANY-AUTHORED Proof gallery — in-house printed parts and test articles (our lab, our results).
Dated record.
- 1996 — Nick Sonnentag’s engineering career begins (formulations chemistry; later senior metallurgical and advanced-manufacturing roles in defense, aerospace, and heavy industry). Company-stated; see founder page.
- 2022 — Formulation studies begin under predecessor entity Sunnyday Ventures LLC (Delaware). Company-stated.
- February 1, 2023 — SUNNYDAY TECHNOLOGIES LLC organized in Wisconsin; the Delaware predecessor entity was cancelled the same year. Official record (DFI S145905).
- January 2026 — Founder moves to Sunnyday Technologies full-time. Company-stated.
- February 2026 — M3-CRETE open-source release; independent trade coverage (above).
- Summer 2026 — NSF I-Corps participant (applied June 2026, accepted; Summer 2026 regional cohort, in progress). Company-stated.
CEMFORGE™ is a trademark of Sunnyday Technologies LLC (USPTO application filed). M3-CRETE, CADCLAW, Shell3D, LOGiMIX, and Open3DCP are Sunnyday Technologies product names.