Stringman is an open-source robot capable of gripping objects across a full 7x7x3 meter room using only four ceiling-mounted motors and cables. Priced at $795, it lifts up to 2.2 kg near the floor and averages 1.9 kg over its work volume. The system uses shared motor torque to scale payload, peaking near the room center where lines distribute load evenly.
Technical specs include a 3-10 meter work area, traverse speed of 0.4 m/s, and dual 1920x1080 anchor cameras. Stringman is OSHWA certified, with all mechanical CAD, PCBs, and control software published under open licenses. It runs air-gapped on local Wi-Fi, keeping AI processing and UI on user hardware.
The package includes Python API and an MCP server for agent workflows, targeting home labs and research. Compared to a typical 0.75 m serial arm with 70 kg payload at $2,500, Stringman offers 185 m³ per $1,000 versus 0.35 m³, representing roughly 500x the volume efficiency at comparable payload. Installation requires securing ceiling anchors, a controller computer, a handheld drill, and a step ladder for about five minutes of calibration.
The robot adapts to rooms with ceiling fans by mounting anchors below blade levels.
Source: Hacker News · Summarized by HeadlinesBriefing