The trickiest part of any printed holding fixture, in my view, is getting real clamping force without supports or screws, and the maker seems to have handled that well here. The build is a benchtop fixture for holding a circuit board steady during soldering or assembly, and it is designed to be support-free and hardware-free, which is a bold goal for a vise.
The construction details stand out. Everything is printed in PETG, in grey and orange plastic. Clamping comes from a manual screw mechanism: an orange threaded rod with a turning knob drives an orange sliding jaw. Alongside that, there are two integrated wire-holding clips, each backed by orange zig-zag compliant springs. Printing the spring geometry as compliant plastic looks like a smart way to hit the hardware-free goal, since the clips need no separate spring parts.
In use, a black board with unpopulated surface-mount footprints sits in the vise opening, and turning the knob advances the screw to clamp it. For wiring work, the fixture is stood up vertically, the spring-loaded blocks are pressed back, a red insulated wire is seated across the center, and the compliant mechanism holds it taut.
One trade-off is worth noting: the maker occasionally nicks the plastic with the soldering iron. Minor burn marks apparently do not affect how it works, and the maker reports the device is working out great so far.