CAI LAB FDM Printing Wiki
From Understanding Materials to Solving Printing Problems
This Wiki is organized into three parts based on where you are in your printing journey. You can work through it from beginning to end or go directly to the part you need.
PART 1 explains why things work as they do; PART 2 helps you decide what to check now; PART 3 explores how to achieve the visual effect you want. Each part can be read independently or used alongside the others.
PART 1 · FDM Printing Fundamentals
If you have not started printing yet, treat this part as an introductory course and read it in order. We begin with a plastic pellet and follow its transformation into filament, then look at how a printer turns filament into a finished object, before exploring print settings, models, and manufacturing applications.
Following the chain from raw materials to filament products, printing, and the model ecosystem helps connect individual topics. Understanding the principles first makes it easier to see why a setting needs to change when a problem arises later.
Chapter 1 · The FDM Printing Industry Chain
Before looking closely at materials and operating procedures, a few questions will help you understand the full FDM printing chain: where raw materials come from, what filament manufacturers do, and how printers use filament.
What Does the Upstream Industry Supply?
The answer is plastic pellets.
Materials such as PLA, PETG, ABS, and TPU enter processing in forms including pellets and provide the basis for filament production. The properties of each base material establish the starting point for its printing behavior.
What Do Filament Manufacturers Do?
They use extrusion to turn plastic pellets into 3D printing filament that can be fed consistently.
Production involves more than drawing plastic into a strand: raw material preparation, blending, melt extrusion, cooling and sizing, pulling, diameter measurement, and winding must work together. Consistent dimensions, a suitable formulation, and production control all affect subsequent printing performance.
How Do Print Users Use Filament?
Users load filament into an FDM printer. The extruder pushes it into the hotend, where it is heated and extruded through the nozzle. Following paths generated from a digital model, the printer deposits, bonds, and cools material layer by layer to form a three-dimensional object.
You can think of the nozzle as a miniature, program-controlled hot glue gun, but forming a part also depends on the feed, motion, heating, and cooling systems working together.
This process is commonly called FDM, or fused deposition modeling, and is a form of additive manufacturing. Instead of cutting material away, it builds an object by adding material progressively. Desktop equipment, a wide choice of filaments, and model resources make it a manufacturing method accessible to individuals and small studios.
The core chain is simple: plastic pellets are processed into filament, and an FDM printer uses that filament to build a physical model layer by layer. Understanding this chain connects materials, processes, and the behavior of the finished part.
