Eric Park Longtime readers of our blog will know that one (or two?) of the earliest projects we shared in a previous blog post are passports and door-opener. If you’ve missed it, you should definitely go and check out how they work, but today we’ll be focusing on door-opener.
Entropy, and the cruel passage of time
door-opener was initially built by Hazel Roeder, and her design had been working flawlessly, up until Fall 2025. Unfortunately, while the design itself would’ve lasted a lot longer, the materials for the suction cups as well as some of the internal components, like the fan bearings, were starting to wear out.
We decided to prioritize a more permanent solution for this problem when people reported that they couldn’t get to Hack Night anymore, because the modules kept losing their grip and falling off of the surfaces.