140mm Case Fan to 125mm Spiral PVC Hose Adapter

This adapter allows you to connect a 125mm PVC spiral ventilation hose to a 140mm standard case fan. Just screw in the fan with e.g. M4 bolts or self tapping fan screws and slide the PVC spiral hose over the other side as seen in the pictures. The fit is quite snug, so be careful to not tear the hose. No extra clamping is required.

Pick the material based on your use case. I used PLA, 0.6mm nozzle and 0.20mm layer height.