molding
   types
      injection (sprue, runner, gate, vent, parting line, flashing)
      insert
      vacuum
      blow
      flexible, soft
   materials
      machineable wax
      low-temp wax
      rigid foam
      gesso
      alginate gel
      urethane rubber, plastic
      silicone
      PDMS (polydimethylsiloxane)
      latex
      thermoplastic, thermoset polymers
      calcium sulfate
         desicant, coagulant, plaster, gypsum, drywall
         DryStone
      Portland cement
         calcium silicate, aluminum/iron oxide, calcium sulfate
         Hydro-Stone
      metal, ceramic powders
      low-temp metal alloys
      food
   additives
      fibers (tension, compression, composites)
      fillers: density, conductivity, flexibility, color, ...
   processing
      testing
      mixing
      deairing
      pouring
         starting
         filling
         vent location
      curing
         polymerization
         cross-linking
         hydration
         endothermic, exothermic
      demolding
         taper
         release agents
         deformation
      storage
      shelf life
   safety
      MSDS
      ventilation
      protection
      disposal
   machining
      testing
      number of axes
      depth of cut, tool clearance
      rough, finish cuts
      tool overlap
      ball end, flat end mills
      mold parts
   software
      Roland Modela Player
      ShopBot PartWorks
      fab modules
         hello.svg, image, mold
         sample.blend, model, sample.cad, STL, mold
         tippy.cad, bottom, top, mold, video

assignment
   design a 3D mold, machine it, and cast parts from it