# Zhihuo RotoSpider Layout MCP server

Rotomolding mold-on-arm layout feasibility: which molds fit on a machine arm/spider, and how.

## Links
- Registry page: https://www.getdrio.com/mcp/net-zhihuo-mcp-rotospider-layout

## Install
- Endpoint: https://mcp.zhihuo.net/roto/mcp
- Auth: Not captured

## Setup notes
- Remote endpoint: https://mcp.zhihuo.net/roto/mcp

## Tools
- check_mold_layout - Check whether molds fit together on a rotational-molding machine arm.

        Every answer comes from the deterministic RotoSpider geometric layout
        engine: rotation-envelope and dead-height checks, pairwise mold-to-mold
        clearance, offset-arm riser selection, and ring arrangements for 3+
        identical molds. It never returns a physically invalid layout.

        Args:
            molds: List of mold objects. Use one explicit unit convention:
                Box/frame mold: {"length_mm": L, "width_mm": W, "height_mm": H}.
                Cylinder/tank mold: {"diameter_mm": D, "height_mm": H}.
                Decimal-inch aliases are length_in, width_in, height_in, and
                diameter_in. Each value is converted once to canonical
                micrometres; do not give both aliases for the same value.
                Optional per mold: "name", "weight_kg", "quantity" (default 1).
            machine: Public-sample straight-arm preset. Available models are
                listed in the tool description. Leave empty AND give no
                explicit geometry to scan all presets ("which machine can take
                these molds?").
            arm_type: 'straight' (dual spiders) or 'offset' (single-spider
                offset/L arm). Empty = both.
            spider_diameter_mm: Custom machine - spider (mounting plate)
                diameter. Giving this plus envelope_diameter_mm switches to
                custom-machine mode instead of presets.
            envelope_diameter_mm: Custom machine - rotation envelope diameter
                (for offset arms: the vertical envelope diameter).
            dead_height_mm: Custom straight arm - unusable center height
                between the upper and lower spider surfaces.
            offset_spider_y_mm: Custom offset arm - spider Y offset from the
                spider center to the sphere center (required for custom offset).
            offset_horz_diameter_mm: Custom offset arm - horizontal usable
                envelope diameter after side trim (defaults to envelope).
            riser_heights_mm: Custom offset arm - available riser heights; the
                solver picks the best (or none).
            *_in: Decimal-inch aliases for the matching custom-arm and
                clearance *_mm arguments.
            max_load_weight_kg: Optional arm weight capacity; the solver loads
                molds only up to this total weight.
            clearance_target_mm: Target mold-to-mold clearance (default 300).
            clearance_min_mm: Minimum acceptable clearance (default 150).
            display_unit: 'mm' (default) or 'in'. Canonical result fields remain
                millimetres; 'in' adds a display projection rounded to 0.00001 in.

        Returns a summary sentence plus per-arm results: feasible, placed vs
        requested counts (per mold type when available), selected riser height,
        spider utilization, center-of-gravity offset, achieved clearance, and
        the engine's reason when molds do not fit.
         Endpoint: https://mcp.zhihuo.net/roto/mcp
- send_feedback - Relay a user question, bug report, or suggestion to the maintainers.

        Args:
            message: The user's feedback text (required).
            contact: Optional reply address the user volunteers.
         Endpoint: https://mcp.zhihuo.net/roto/mcp

## Resources
Not captured

## Prompts
Not captured

## Metadata
- Owner: net.zhihuo.mcp
- Version: 1.0.2
- Runtime: Streamable Http
- Transports: HTTP
- License: Not captured
- Language: Not captured
- Stars: Not captured
- Updated: Jul 15, 2026
- Source: https://registry.modelcontextprotocol.io