M5 Hex Nut Lock Nuts have several uses in a 3D printer:

it should be dried in a filament dryer before reuse

It consists of recycled PLA and comes from production errors

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CreatBot - Heatbreak with PTFE tube - F160

E3D - ObXidian™ High Flow Hotend - A1/A1 Mini/A2 (Pick a Size) Creatbot Series - Reservedel M5 Hex Nut Lock NutsE3D ObXidian High Flow Hotend for Bambu Lab A1 & A1 Mini Get maximum performance out of your Bambu Lab A1 or A1 Mini with the E3D ObXidian High Flow Hotend an official Bambu approved upgrade, designed for demanding materials, high speeds, and long life. With an optimized nozzle geometry, ObXidian delivers up to 70% higher flow rate than standard Hotends. This means faster printing, stronger layer bonding and more efficient use of the printer's motion