Copper Wire Brush Protector Cap. These brushes can be used to clean the 3D-printer nozzle.
Link for AliExpress-Item:
Copper Wire Toothbrush
Update: V2 contains a small lip that keeps the cap on securely.
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BrushProtector.stl | 202.2KB | |
BrushProtectorV2.stl | 225.3KB |