‘Going just 0.5 mm thicker would probably have saved me months of engineering’: Redditor crafts actual credit card sized computer
A Reddit user named krausler has designed and built the Muxcard, a genuine credit card-sized computer—a feat that distinguishes it from mass-market alternatives often marketed with similar claims. Unlike Raspberry Pi boards and other devices frequently described as “credit card-sized,” the Muxcard can actually fit into a wallet or pocket, representing a significant achievement in hardware miniaturization.
The creator undertook an ambitious engineering challenge to achieve such an extremely compact form factor. In discussing the project’s complexity, krausler noted that “going just 0.5 mm thicker would probably have saved me months of engineering,” underscoring the meticulous optimization required to reach such minimal dimensions while maintaining full computer functionality.
The Muxcard exemplifies the kind of innovative hardware projects emerging from the DIY computing community, where individual enthusiasts combine technical expertise with creativity to push the boundaries of what’s possible in miniaturization. The project’s success in creating a genuinely pocket-sized functional computer—rather than simply claiming credit card dimensions—makes it a notable contribution to the hobbyist hardware space.