Checking in, thoughts on 3d pens, thermoacoustic cooling, and other bs

I've got a couple of workers building an atrium over the west side deck. I believe it will heat 4k gallons water and keep the house warm in winter. Evaporative cooling will help in warm weather, but probably need geothermal.

Been watching YouTube people playing with 3d pens. The results I saw were disappointing; although, some of the work was intricate and artistic. My interest is less artistic and more model oriented, which leaves them lacking. I need strait edges, triangles, curves, and more than one extrusion size and shape.

A thermoacoustic cooler can be driven by concentrated solar, with tracking, heat. With heat pipes to move the heat, cost of indoor refrigeration would be low. Moreover, a solar thermoacoustic chiller could sink heat from a heat pump or refrigerated air conditioner to improve their efficiency. I don't understand why I can't buy one.