One significant problem with today’s extrusion 3D printers (the kind more people could afford for home, of the order of $2,000) is the output is layered, like a stack of sliced bread, and rather weak in that these slices too easily detach from each other. Almost all samples I touched broke between layers when applying light pressure with the fingers of one hand. Sure, you can design with that in mind, but that is a significant restriction. Wouldn’t want to make an irrigation valve to hold water pressure when you know it has that kind of weakness.
It isn’t surprising, given how the filament of ABS or PLA gets deposited in the XY plane, then after a tiny move upwards on the Z axis another XY plane, at which time the earlier XY plane’s filament has cooled off already.