Printer platform + control
M3-CRETE
An experimental open-hardware reference platform designed for training and controlled mix-development trials.
Sunnyday Technologies · January–August 2026
Built to be shared.
Open tools. Technical writing. A connected body of engineering work.
Eight months of exploring practical gaps in additive construction and adjacent manufacturing: accessible reference hardware, shared data structures, CAD verification and assembly benchmarking.
The open toolset
From hardware to the data behind it.
Seven toolsets span eight public repositories; M3-CRETE and its firmware are shown together. Follow the repositories for source files, documentation and license terms.
Concrete-printing data
Open3DCP
A public schema for material, process, test and provenance records, designed to make results easier to compare and reuse.
CAD assembly checks
CADCLAW
Open-source tooling for inspecting STEP assemblies and checking geometric interference and assembly conditions.
Mechanical assembly benchmark
MARB
A benchmark for examining how AI systems assemble mechanical components, with published methods and run records.
Filament data
PARAMAT3D
Brand-specific filament records and print-condition information for FFF additive manufacturing.
Concrete topology optimization
TOPOCRETE
Research tooling for exploring topology optimization with concrete-oriented tension penalties.
Polymer-printing data
Open3DPP
A public schema for polymer material identity, printing conditions, geometry and measured properties.
The commit curve records January 1–August 31, 2026 UTC. OpenSpool’s inherited fork history and the organization-profile repository are excluded.
The thinking behind the tools
Technical reading list.
Full-length, self-published technical articles and working papers from the same period. News roundups, podcast announcements and short summaries are not included.
· Technical article
Why the Loop Matters: Process Variables Are Not Noise
Interpreting process context in interlaboratory concrete-printing data.
· Technical article
3D Concrete Printing Process Control: What 30 Labs Reveal
A discussion of process variables and reported concrete-printing outcomes.
Archive notice only; full text unavailable.
· Technical article
Why Concrete 3D Printing Mix Design Demands Machine Learning Formulation Tools
Data requirements and machine-learning approaches to mix formulation.
Archive notice only; full text unavailable.
· Technical article
M3-2: Full CAD Release
An open printer design, its parametric CAD and engineering choices.
· Technical article
Will AI replace $10k CAD Assembly Check Licenses With 500 Lines of Open-Source Python.
Geometric checks and a Python testing framework for CAD assemblies.
· Technical article
Will AI-generated CAD outrun V&V?
The verification gap surrounding AI-generated geometry.
· Working paper
Convergence Engineering
Evidence and verification in AI-assisted CAD development.
· Technical article
FusionClaw - Designing a Lobster Claw in Autodesk Fusion 360 from Claude Chat
A lobster-claw modelling case study using a conversational CAD interface.
· Technical article
We Print Shells!
A concept article on printed shells, cavities and building systems.
· Technical article
Performance-Based Specifications in Architecture: A Complete Guide for Design Professionals
Defining measurable outcomes in architectural specifications.
· Technical article
The Bitter Lesson
An essay on computational methods in materials engineering.
Archive notice only; full text unavailable.
· Working paper
Open3DCP: A Public Data Schema for 3D Concrete Printing
Recording material composition, printing context, test results and provenance.
· Technical article
How well can AI assemble a machine? The first benchmark results.
A company-authored benchmark of AI-assisted component assembly.
· Technical article
Tested: Fable 5 (Mythos) for CAD Mechanical Assembly Readiness Benchmark
A mechanical-assembly benchmark examining model effort settings.
· Technical article
We Tested local AI models using Vision for Mechanical Assembly... and it got worse (?)
A comparison of local vision and text approaches to CAD assembly.
· Technical article
Can AI Build a House? Benchmarking Pascal
A benchmark of AI-assisted house assembly in Pascal.
Responses, corrections and recommendations are welcome. Tell us what you think.
Download the illustrated reading list (PDF)