Nobody ever created a reliable self-contained foolproof PCB etching procedure. That's why nobody etches their own PCBs.

If there was a box that received supplies and outputted usable PCBs with minimum external mess, a lot of people that currently buy boards would use it instead.

(And well, PCB manufacturing is basically the same process as chip fabrication, without the miniaturization. If nobody managed to create a "PCB printer", why do people keep hopping for a "chip printer"?)