LeapFrog BOLT User Manual page 13

2.2 BOLT PRINTER HEAD OVERVIEW
1. Filament guide tube
2. Push-in coupling
3. Filament pinch wheel (used to control the grip on loaded filament)
4. Hot-end thumb screw (used to swap hot-ends tool-less)
5. Fan-duct
6. Hot-end (includes also nozzle)
7. Nozzle
8. Nozzle wipe
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