Filament Sensor “SwivelDock” Mount

Custom top-rail filament runout sensor mount for the Ender 3. This design uses a ball bearing pivot so the sensor/guide can swivel smoothly as the extruder moves, keeping the filament path aligned and reducing drag or sharp angles during travel. Mounts cleanly on the top rail and keeps the filament feeding straight from the spool to the extruder.

Features:

Mounts to the top X rail

Ball bearing swivel tracks the extruder movement automatically

Helps maintain a smoother filament path (less rubbing/binding)

Clean, compact design that keeps the sensor in a consistent spot

Works great for top-mounted spools or side-mounted spool setups

Hardware:

1x ball bearing (press-fit)

Standard sensor screws/bolts (depends on your sensor model)