Parametric CAD users constantly need specialized components and macros, but distribution is fragmented across forums and personal repos.
Create a version-controlled marketplace with standardized metadata, dependency management, and compatibility testing. Focus initially on Rust-based CAD tools before expanding.
Monetize through premium listings and commercial template sales. Start with a basic directory of verified SolidCraft extensions.
The risk is low initial liquidity - you'll need to build critical mass of both creators and users quickly.