The starting point here is a familiar headache: hygroscopic filament slowly suffering in a humid garage. The maker's answer was to take two wine cooler refrigerators and turn them into one active dry box, keeping hygroscopic spools protected from the garage air while stored.
The build itself is thorough. The original refrigeration hardware came out, and the interior was planned in Autodesk Fusion, covering both the layout and the drawer slides. Six pull-out drawers on Hafele ball-bearing runners hold 16 spools, with 20 mm PVC conduits inside. A Ryobi oscillating multitool trimmed the molded plastic shelf ribs, and a hole saw cut the round duct openings at the rear. The rear service panel was machined and engraved on a Makera Carvera Z1 CNC mill.
The supporting parts stand out. Printed components came off a Bambu Lab P2S running Bambu Lab ASA carbon fiber through a 0.6 mm hardened steel nozzle, with an AMS 2 Pro on board. Dehumidifying falls to a Rosahl M-5J1R solid-state electrolysis membrane powered at roughly 3.3 V DC, paired with flexible aluminum ducting and fans. An Arduino with an Ethernet shield runs the electrical side, alongside magnetic door sensors and a humidity and temperature sensor.
The wrinkle worth knowing: air sneaking in under the fridge doors initially stopped the humidity from dropping. Sealing those gaps fixed it, and Home Assistant graphs showed relative humidity settling between 19.5% and 19.8%. Given how sensitive that result was to small leaks, keeping the enclosure airtight over time looks like the thing to watch.
Project by Yeah Nah DIY. Watch it on their YouTube channel: