This 3D-printed contraption is by Igor Daemen, an Eindhoven-based product designer. "I designed this businesscard embosser to be modular and 3D printable without using any support and without any hardware required to assemble," he writes.
"The tolerances are tight," Daemen explains. "And some materials work better then others. I have had best results using Basic PLA."
You can download the files for free here.