Benchtop Power Supply

To be honest, if you want a benchtop power supply for your hobby electronics projects and you're looking around on Thingiverse I'd recommend you just go and buy a commercial PSU; done and RTG. You don't build one from scratch because you're going to save money, or get a better final product. A commercial benchtop CV/CC PSU has already been optimized for both cost and performance; clearly the more you spend generally the better the final product will be.

Having said that, if you have a large-ish 3D printer, some spare parts sitting around, plenty of filament, know how to safely terminate wires containing line voltages, and time on your hands...and understand the DIY route with all it's pros and cons, then maybe this design, in all it's half-sorted glory, is interesting.

Disclaimer
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Look, any type of DIY project that involves wiring of line circuits (i.e. circuits that you plug into the wall socket) are best left to the pros if you are not intimately familiar with