How FDM Printing Works: From Spool to Part, One Layer at a Time

Most desktop 3D printers are, at heart, a very precise hot glue gun on a robot arm. In this episode we follow a spool of plastic all the way to a finished part: what fused filament printing actually is, the handful of components that every machine shares, how a 3D model becomes thousands of lines of G-code, and what the nozzle is really doing as it lays down each 0.2 mm layer. **You'll come away understanding** why FDM and FFF describe the same process and why only one company can use the first name; what the hotend, extruder, heated bed and gantry each do, and how a bed-slinger differs from a CoreXY machine; the model-to-slicer-to-G-code workflow and the decisions the slicer makes about layers, walls, infill and supports; why a 0.4 mm nozzle, 0.2 mm layers, a roughly 200 °C nozzle and a 60 °C bed are the defaults for PLA; what really drives print time and material cost, with grams, minutes and Australian dollars; and why first prints fail, from poor adhesion to warping and stringing. For anyone who has never seen a printer run, anyone about to unbox their first one, and anyone who has wondered why their prints come out ribbed. Practical tip from the episode: the strength of a printed part comes mostly from its walls, not its infill, so add a perimeter before you add infill percentage. Need something printed? Upload your STL, 3MF, OBJ or STEP file at www.3dprinting.zone for an instant price, shipped Australia-wide. Sources: Prusa Knowledge Base, Bambu Lab Wiki, Prusament and Polymaker technical data sheets, E3D, the RepRap project, Wikipedia (Fused filament fabrication, CoreXY, G-code), Hackaday, 3D Printing Industry, CNC Kitchen.