Research

Open-access research from Sunnyday Technologies

Methodology papers, whitepapers, datasets, and the open-source tooling that produces them. Where possible the work is self-hosted here and mirrored on Zenodo with concept DOIs for citation.

Methodology paper

Convergence Engineering

Commissioning autonomous software by measuring the rate at which novel failures trend toward zero. A methodology paper introducing “time to silence” as the metric for the commissioning phase of autonomous software systems. CC BY 4.0 preprint, v1.0 deposited on Zenodo.

Read · Self-hosted

Convergence Engineering v1.0

Sonnentag, N. (2026). The full whitepaper, open-access, with figures and references inline. Cite as Concept DOI 10.5281/zenodo.19863080.

Self-hosted → DOI · Zenodo

Concept DOI 10.5281/zenodo.19863080

Resolves to the latest version of the paper. CC BY 4.0. Use this DOI in citations.

zenodo.org → DOI · v1.0 archive

v1.0 DOI 10.5281/zenodo.19863081

Pinned version of the v1.0 archive. Use this when you need a stable reference to a specific version rather than “latest”.

zenodo.org →

Open datasets and software

Open releases

The hardware, the schema, and the validation tooling that the methodology rests on. All three have Zenodo concept DOIs for stable citation.

Open hardware

M3-CRETE

Pallet-scale open-source 3D concrete printer. CERN-OHL-W-2.0. Source CAD, BOMs, firmware, build documentation.

DOI 10.5281/zenodo.19647436 → Open dataset / schema

Open3DCP

Open schema for 3D concrete printing mix-design and test records. Apache-2.0. Public v1.5 schema with Zenodo DOI and Sunn3D whitepaper.

DOI 10.5281/zenodo.19647471 → Open software

CADCLAW

Pytest-style validation framework for CAD assemblies. MIT-licensed Python on PyPI. The CAD-validation tooling behind M3-CRETE.

DOI 10.5281/zenodo.19647391 →

Manuscripts under review

Current and forthcoming papers

Published whitepapers and manuscripts in preparation. Published work is linked directly; in-preparation manuscripts remain listed for collaboration and review-copy access.

In preparation

Self-Verifying LLM-Driven Parametric CAD Assemblies

Lessons from a meter-scale concrete 3D printer. Documents the AI-driven CAD pipeline behind M3-CRETE, the role of CADCLAW validation gates, and the iterative feedback loop between Claude-driven CAD and physical assembly.
Published whitepaper

Open3DCP: A Public Data Schema for Performance-Based 3D Concrete Printing Records

The public v1.5 whitepaper explains Open3DCP as a performance-based reporting schema for 3DCP composition, process parameters, specimen/test context, measured properties, and provenance.

Citation

Citing this work

Use the concept DOI for any citation that should resolve to the latest version. Use the version DOI when you need a stable reference to a specific release. CC BY 4.0 attribution requires only that the citation include the author and the DOI.

Author: Nick Sonnentag (ORCID 0009-0002-1897-384X), Sunnyday Technologies, Appleton, WI.