Sometimes things just don’t work the way you want them to—especially when you buy a “12-bay” budget PC case and realize the drive cage tolerances are… not great. In this video I show how I turned that into a win by designing and 3D-printing my own NAS drive enclosures and hot-swap-style caddies. I used a pair of 5-port SATA backplanes (meant for the Jonsbo N1) and built a 10-bay setup that mounts using the case’s existing 120mm fan spacing, with heat-set inserts to keep it sturdy and reduce vibration. The end result is a DIY NAS that looks clean even with a glass side panel, and the drives are actually easy to swap. The bigger takeaway though is that designing your own 3D-printable PC parts isn’t as scary as it sounds. I walk through getting started in Onshape, how I measure things (calipers are your best friend), and how I model a simple drive caddy from scratch using sketches, dimensions, constraints, extrudes, and mirroring. I also share the practical stuff—PLA vs PETG decisions, cost breakdown (a little over $200 all-in for the case + printed parts + hardware + PCBs), and what I’d improve next time (more airflow between drives).