Study guide — what to focus on

This module is curated — the teaching is a top free course (linked in the card above); our job is to point you at the right things, make you prove it, and certify you.

The plan

1. Watch the course (the card above). You don't need to memorise it — aim to understand the ideas below.
2. Focus on these — they're what the check tests and what you'll use for real:
   • How FDM works — molten thermoplastic extruded through a nozzle, one thin layer on top of the last. Almost everything else follows from this.
   • Filaments — PLA (easy, the beginner default), PETG (tougher, more heat/impact resistant), ABS (strong but fussy, wants an enclosure), TPU (flexible/rubbery). Know when to reach for each.
   • The slicer — it turns your model into layer-by-layer G-code. Learn layer height (detail vs. time), infill (how solid the inside is), and print speed/temperature.
   • Supports & overhangs — FDM can't print onto thin air; overhangs past ~45° and bridges need support beneath them.
   • The first layer — a level bed and the right nozzle gap are the whole game for bed adhesion. Most "it won't stick" problems live here.
   • Print-quality troubleshooting — recognise stringing (retraction/temperature, dry filament), warping, and poor adhesion, and know the first knob to turn.
3. Prove it in Forge (next section) — design a part for FDM, thinking about how it will actually print.
4. Take the K-Check to earn your certificate.

Why this connects to building real products

FDM is how most product ideas first become something you can hold. Once you know how the machine lays down plastic, you start designing for it — orienting the part so its layers run the strong way, avoiding overhangs that need ugly supports, and giving walls enough thickness to survive. In Forge's 3D part designer (Prototype) you describe a part and get printable geometry back; understanding FDM lets you judge that output like a maker — will this first layer stick, will that lip need support, is the wall thick enough — instead of just hoping it prints. That's the difference between a model and a part.

Time to apply it. The course taught you how FDM builds a part layer by layer — now design something that has to actually print cleanly.

This opens Forge's 3D part designer: send the prompt below and it generates a compartment tray for you. As the geometry comes back, look at it the way the course taught — which way do the layers run, are there overhangs that would need support, are the walls thick enough to come off the bed strong? That judgement, model ↔ printable part, is the whole point.