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The journey of a 3D print

3D printing is more than just hitting “print.” It is a carefully choreographed process that turns a spool of plastic into a physical, functional object - layer by layer. Let’s follow that journey from the very beginning: loading filament, receiving a design, and executing a print to completion.
Flow diagram showing the journey of a 3D print: load filament, slice to G-code, preheat, level bed, print layer by layer, cool and remove

The six core stages of every 3D print

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What is FDM?

Your printer uses Fused Deposition Modeling (FDM), also called Fused Filament Fabrication (FFF). The idea is simple:
Melt a thin strand of plastic and lay it down in precise paths, one thin layer on top of another, until the layers add up to a 3D object.
Each layer is only a fraction of a millimeter thick. Stack hundreds of them and you get a solid part. This is additive manufacturing - you build up material - as opposed to subtractive methods like carving or milling that cut material away.
Cutaway diagram of FDM extrusion showing filament, extruder gear, cooling fan, heater block, melt zone, nozzle, and deposited layers

Inside the extruder and hotend: how filament becomes a printed layer

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Step by step

Step 1: Loading the filament

It all begins with filament - a long strand of thermoplastic wound on a spool. This could be PLA, PETG, ABS, or another type, each with different properties and temperature requirements. The filament is fed into the printer’s extruder, where gears grab it and guide it down toward the hotend. But nothing melts yet - the printer still needs instructions.

Step 2: Receiving the G-code file

A designer creates a 3D model, then runs it through slicing software like Orca-Flashforge, Cura, or PrusaSlicer. Slicing turns the model into a special language called G-code. G-code tells the printer exactly what to do: where to move, how fast, how hot, and how much filament to push out. The file is loaded via USB, or sent over Wi-Fi.

Step 3: Preheating the printer

Before anything prints, the printer heats up. The hotend rises to between 190 C and 250 C depending on the filament, melting the plastic just enough to squeeze through the nozzle. At the same time, the heated bed warms up to help the first layer stick. A warm bed prevents warping and keeps layers flat.

Step 4: Bed leveling and calibration

The printer checks that the nozzle is the correct distance from the bed. Too far and filament will not stick; too close and the nozzle scrapes or clogs. The Adventurer 5M uses automatic bed leveling to measure and adjust the distance across the whole bed. Once leveled, the printer knows exactly where to begin.

Step 5: Priming the extruder

Before the real print starts, the printer extrudes a small line of filament off to the side. This is called priming - it confirms melted plastic is flowing smoothly and no clog has formed.

Step 6: The print begins

Now the action starts. The printer moves along the X, Y, and Z axes as it lays down the first layer. This is the most important part of the whole print - if the first layer sticks properly, the rest usually succeeds. The printer then continues, layer by layer, drawing the shape in melted plastic.

Step 7: Monitoring and adjustments

During the print you can monitor temperature, speed, and layer progress. Cooling fans turn on to solidify each layer. If something goes wrong - filament runs out or layers shift - you can pause or stop the print.

Step 8: Print finishes and cools down

After the final layer, the printer stops extruding and cools. The hotend and bed gradually drop in temperature. Once cool, you gently remove the print. Flexible plates let the part pop off; others need a scraper.

Step 9: Post-processing (optional)

Depending on the print, you may remove supports, sand edges, or glue parts together. Some prints can be painted or polished for a professional finish.

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The three axes of motion

An FDM printer positions the nozzle in 3D space using three axes:
Diagram of the three axes of motion: X left-right, Y forward-back (bed moves), Z up-down (layer height)

The X, Y, and Z axes of motion on a 3D printer

X axis

Left and right movement of the print head.

Y axis

Forward and back. On the Adventurer 5M, the build plate moves to create the Y motion.

Z axis

Up and down. After each layer finishes, the Z axis raises the print head so the next layer can be laid on top.

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Why the first layer matters most

If you remember one thing from today, remember this: the first layer makes or breaks a print.
  • If the first layer sticks evenly to the bed, the rest of the print has a stable foundation.
  • If it does not stick, the print can peel up, shift, or turn into a tangled mess of plastic (a “spaghetti” failure).
That is why bed leveling, bed temperature, and a clean surface matter so much - and why we spend real time on calibration in this camp.
Adhesion helpers like a glue stick or painter’s tape give the first layer extra grip. The Adventurer 5M includes a washable glue stick for exactly this purpose.

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Why this matters

Every successful print is the result of understanding this full process. From loading filament, interpreting G-code, heating, calibrating, and extruding, 3D printing is a combination of engineering, design, and creativity - all working together to bring ideas to life.
Keep this journey in mind all week. When a print fails later, you will be able to ask “which step went wrong?” - loading, slicing, heating, leveling, or adhesion - and fix it fast.