M3-CRETE: Open-Source Concrete Printer You Can Build and Deploy in the Field

An Open-Source Solution for Construction 3D Printing

Sunnyday Technologies has unveiled M3-CRETE, a fully open-source 3D concrete printer designed for deployment across various work environments — including remote field locations. Unlike industrial construction printers that require specialized infrastructure, M3-CRETE prioritizes accessibility and field serviceability.

Modular Design Scales with Your Needs

The system features a modular architecture that can scale from 1 cubic meter to 4 cubic meters using swappable components. This means users can start small and expand as needed, without committing to a massive initial investment.

The company has released a draft bill of materials on GitHub for community feedback and customization. This open approach allows makers, contractors, and researchers to adapt the design to their specific needs.

Built for Field Operations

What sets M3-CRETE apart is its focus on field serviceability. The printer uses common components — standard extrusions, motors, and controls — that can be repaired or replaced in remote locations without specialized tooling.

Target applications include:

• Hardscape elements for landscaping
• Agricultural infrastructure
• Water control components
• Modular construction parts
• Residential building blocks

Works with Standard Slicing Software

Rather than reinventing the wheel, M3-CRETE integrates with established slicing software including Cura, OrcaSlicer, and PrusaSlicer. Users will need to adjust nozzle size settings for the larger extrusion volumes required in concrete printing.

The system runs on open-source firmware options like Marlin or Klipper, keeping the project fully open and avoiding vendor lock-in.

Community-Driven Development

Sunnyday Technologies is collaborating with universities in Wisconsin to provide in-person support for field-test units planned for 2026. This academic partnership aims to validate the design in real-world conditions while building a community of users and contributors.

The project represents a shift toward democratizing construction 3D printing — moving away from proprietary, million-dollar systems toward accessible, community-built solutions.