filament - No extrusion, but manual extrusion works - 3D Printing Stack Exchange

I just bought and build my first 3d printer (HE3D K280 with Marlin) and I'm encountering some problems with Cura 4 and Repetier. When I load and slice a part, the printer does not extrude anything

creality cr 6 - Quantum PLA stops extruding, other PLA works fine - 3D Printing Stack Exchange

creality ender 3 - Filament end expanding and seizing - 3D Printing Stack Exchange

diy 3d printer - No extrusion, but manual extrusion works. The motor turns but no filaments pushed down - 3D Printing Stack Exchange

An open source extrusion bioprinter based on the E3D motion system and tool changer to enable FRESH and multimaterial bioprinting

Accelerating 3-D printing, MIT News

print quality - What causes bubbles in extruded filament? - 3D Printing Stack Exchange

Voxelab 3D Printer Aquila D1, Auto Leveling 3D Printers with Linear Guide, Dual-Gear Direct Extruder, 300℃ High-Temp Printing Support Multiple Filaments, Print Size 235x235x250mm: : Industrial & Scientific

Tronxy X5SA-500 2E 2-In-1-Out DIY Large Size Dual Extruder 3D Printer – Tronxy 3D Printer

Polymers, Free Full-Text