Watch, understand, and analyze every stage of 3D printing — from digital file to physical object.
Learn — read and understand
The complete 3D printing workflow
3D printing is a four-stage process: (1) Design the object in CAD software. (2) Export the design as an STL file. (3) Import the STL into slicing software, which converts it into layer-by-layer instructions. (4) Send the sliced file to the printer, which builds the object layer by layer using melted filament.
What is an STL file?
STL (Standard Tessellation Language) is the file format that connects CAD software to 3D printers. It describes the surface of a 3D object as a mesh of thousands of small triangles. The more triangles, the more accurately it represents curved surfaces. STL is the universal language of 3D printing.
Slicing software: translating design into printer instructions
Slicing software (like Cura or PrusaSlicer) takes your STL file and "slices" it into hundreds or thousands of horizontal layers. It calculates the exact path the printer nozzle must follow for each layer. It also adds support structures for overhanging parts and generates the final G-code file.
Observing a print: what to look for
When watching a 3D printer, observe: the nozzle temperature (PLA prints at ~200°C), the bed temperature (~60°C), the first layer adhesion (critical — if it does not stick, the print will fail), the layer-by-layer build-up, and any support structures being generated.
Explore — tap to go deeper on each printing stage
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STL file — triangles everywhere
An STL file describes every surface as a mesh of triangles. More triangles = smoother but larger file. Curves are always faceted approximations.
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Layer height trade-off
0.1mm = beautiful but slow. 0.3mm = fast but visible layers. Choose based on whether appearance or time matters more.
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FDM printing: the physics
Filament melts at 200°C and is deposited in 0.1–0.4mm lines. Molten plastic cools and solidifies within seconds.
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First layer = the foundation
If layer 1 fails, the entire print fails. Bed leveling is everything. Most print failures start with a bad first layer.
Order the 3D printing workflow steps correctly
Drag or tap a label, then drop/tap on a zone
Export as STL
Design in CAD
Slice the file
Print object
Stage 1
Stage 2
Stage 3
Stage 4
Quiz — 3D printing process, 5 questions
1What does slicing software DO to your 3D design file?
2What is an STL file?
3A lower infill percentage produces a part that is…
4Why is the FIRST LAYER of a print the most critical?
5What temperature does PLA filament melt at in a typical FDM printer?