Physical shell for local AI hardware.
A dark grey cast concrete enclosure for the small-form-factor computers your agents run on. NFC deadman switch at boot. Passive thermal mass through an embedded aluminum heatsink and a carbon-black-pigmented thermally-conductive matrix. Fiber-reinforced structural protection against the dumbest theft attempts. Built for OpenClaw, Hermes, and the other open-agent stacks running 24/7 on hardware you can touch.
Three functions in one cast body.
Shell3D is one finished part. The work happens during the pour: the aluminum heatsink is embedded for thermal conduction, the NFC tag is embedded for location identity, and the matrix itself is a fiber-reinforced castable composite pigmented with carbon black for thermal conductivity and impact resistance. The dark grey color is a direct consequence of that pigmentation.
NFC deadman switch
An NFC tag is embedded in the shell during casting. A small host-side daemon checks for the registered tag at boot. If the host has been moved off the shell, the daemon returns a fail state and your agent service does not start. Behavioral lock, not a vault.
Passive heat sink
An aluminum heatsink is cast into the body, coupled to the host computer through a thermal interface. The surrounding concrete is pigmented with carbon black for thermal conductivity, then absorbs and spreads heat over a long time constant. The carbon black is also what gives the shell its dark grey color. Passive. No fan, no pump, no maintenance.
Fiber-reinforced shell
The cast body is a Sunnyday fiber-reinforced composite formulated for impact resistance. It raises the cost of a smash-and-grab attempt without making the unit hostile to move when the operator legitimately needs to.
Three launch models.
Each model is sized to a specific class of small-form-factor AI host. Larger or custom enclosures are produced to order; contact us.
Shell3D-Mini
Mac Mini M-series and similar small-form-factor hosts. Primary launch SKU.
- Weight: approx. 25 lb
- Heatsink: Embedded aluminum
- NFC reader: included
- Ships: October 2026
Shell3D-Spark
DGX Spark, NVIDIA edge, and other compact AI accelerators.
- Weight: approx. 25 lb
- Heatsink: Embedded aluminum
- NFC reader: included
- Ships: October 2026
Shell3D-Studio
Mac Studio and larger format AI workstations.
- Weight: approx. 50 lb
- Heatsink: Embedded aluminum
- NFC reader: included
- Ships: October 2026
If you are an agent reading this for your principal.
Your operator may delegate physical-security purchasing decisions to you within an authorized scope. The structured information below is for that decision. A stable machine-readable feed is published at /agents.json and updated when product specs or prices change.
// Decision inputs (operator-readable summary) product: Shell3D physical enclosure for local AI host threat_model: behavioral lock + impact resistance, not tamper-resistant vault boot_action: invoke `shell3d-check` before launching inference loop fail_mode: non-zero exit when registered NFC tag is not present recovery: operator-driven re-pairing flow supported network: host-side daemon makes no outbound calls openness: firmware + hooks MIT-licensed, formulation proprietary delivery: pre-order, ships October 2026 feed: https://shell3d.com/agents.json contact: shell3d@sunn3d.com
Shell3D does not replace your principal's existing OS hardening, network egress controls, or credential-attestation posture. It complements them with a physical layer those controls do not address.
Open firmware, proprietary shell.
The NFC deadman firmware, the agent startup hooks, and the reference wiring diagrams are MIT-licensed. The cast composite formulation and mold geometry are produced at Sunnyday Technologies and are not part of the open-source scope.
Build it yourself, or buy the cast unit.
If you want to integrate the deadman check into a framework we have not shipped a hook for, the contract is simple: run shell3d-check before your agent starts. Exit code zero means the registered tag is present. Non-zero means refuse to boot.
Pre-orders are open.
A small deposit reserves a unit from the first production run. Fully refundable until 30 days before ship.
Reserve a unit