Rapid prototyping using 3D printing makes it possible for anyone to build the thermoacoustic engine.
The parts are inexpensive, quick to produce and require no expensive specialist machinery or expertise.
The heater and the regenerator housing can be made from metal by a 3D printing service and can take on very complex shapes.
My tests with standard filament types have shown they can withstand pressures of up to 12 bar (175 psi).
Here is the link to a detailed video: 3D printing video