  The accessibility of tools to model artifacts is one of the core driving
factors for the adoption of Personal Fabrication. Subsequently, model
repositories like Thingiverse became important tools in (novice) makers'
processes. They allow them to shorten or even omit the design process,
offloading a majority of the effort to other parties. However, steps like
measurement of surrounding constraints (e.g., clearance) which exist only
inside the users' environment, can not be similarly outsourced. We propose
Mix&Match a mixed-reality-based system which allows users to browse model
repositories, preview the models in-situ, and adapt them to their environment
in a simple and immediate fashion. Mix&Match aims to provide users with CSG
operations which can be based on both virtual and real geometry. We present
interaction patterns and scenarios for Mix&Match, arguing for the combination
of mixed reality and model repositories. This enables almost modelling-free
personal fabrication for both novices and expert makers.
