Understanding 3D printing terms makes it much easier to choose a material, understand printer settings, troubleshoot a failed print, or explain what you need when ordering a custom part. Words such as STL, slicer, layer height, infill, supports, nozzle and G-code can sound technical at first, but each describes one specific part of the journey from a digital model to a physical object.
What are common 3D printing terms?
3D printing is an additive manufacturing process that creates an object layer by layer from digital design information. The exact process depends on the technology: FDM/FFF printers deposit thermoplastic filament through a heated nozzle, while resin printers use light to cure liquid photopolymer.
A useful way to understand the workflow is:
3D idea → 3D model → file → slicer → print settings → printer → finished part
Each stage has its own terminology.
In short: You do not need to memorise every technical word. Start with the terms connected to the model, file, slicer, printer, settings and finished print.
3D model and file terms you should know
CAD
CAD stands for Computer-Aided Design. It is commonly used to create accurately dimensioned digital designs for products, prototypes, enclosures and mechanical parts.
3D model
A 3D model is the digital representation of the object you want to manufacture. A decorative statue, prototype enclosure or replacement component can all begin as a 3D model.
STL file
An STL file is one of the most common formats used to move a 3D model into a slicing workflow. It represents the surface geometry of the model.
OBJ file
An OBJ file is another common 3D model format. It is often encountered with sculpted, scanned or visually detailed models.
3MF file
3MF is a 3D Manufacturing Format designed for 3D printing workflows. Depending on the software, it can preserve information beyond basic model geometry.
Mesh and watertight model
A mesh is the connected geometric structure describing the surface of a model. A model intended for printing should form a properly closed, usable surface. Gaps, overlapping geometry or other mesh errors can cause slicing problems.
If you want a deeper explanation of STL and 3MF files, see What Is an STL File in 3D Printing? and What Is a 3MF File? STL vs 3MF Explained.
In short: The model describes the object; the file format is how that model is stored and transferred between design and printing software.
What do nozzle, extruder and print bed mean?
Nozzle
The 3D printer nozzle is the opening through which material is deposited in an FDM printer. Nozzle diameter affects material flow, detail and potential printing speed.
Extruder
The extruder is the mechanism that feeds filament toward the hot end. It works with the hot end and nozzle to deposit material.
Hot end
The hot end heats the filament before it passes through the nozzle.
Build plate or print bed
The print bed, also called the build plate, is the surface on which the model starts printing. Good first-layer adhesion is important for a reliable print.
X, Y and Z axes
The X, Y and Z axes describe movement in three dimensions: X is left and right, Y is front and back, and Z is up and down.
Z offset
Z offset describes the nozzle's position relative to the printer's reference Z position. It can affect how the first layer is placed on the build plate.
In short: The extruder feeds the filament, the hot end heats it, the nozzle deposits it, and the build plate provides the surface where the print begins.
What is a 3D printer slicer, and what is G-code?
3D printer slicer
A 3D printer slicer converts a 3D model into printable layers and machine instructions. It is also where settings such as layer height, speed, temperature, infill and supports are commonly selected.
G-code
G-code is a set of machine instructions used by many 3D printers. It tells the printer how to move, extrude material and perform other actions during the print.
Toolpath
A toolpath is the route followed by the printhead while creating the part. Different toolpaths can affect print time, surface appearance and mechanical behaviour.
Print profile
A print profile is a saved group of settings for a printer, material or type of print.
For a deeper explanation, read What Is Slicer Software in 3D Printing?.
In short: Your printer normally does not work directly from an STL or OBJ. The slicer converts the model into instructions the machine can execute.
What are layer height, walls, infill and print speed?
Layer
A layer is one horizontal section created during printing. A finished object is built from many layers stacked together.
Layer height
Layer height is the vertical thickness of each printed layer. Smaller layers can make layer lines less noticeable and can help with visible detail, but they usually increase the number of layers and therefore printing time.
Walls or perimeters
Walls, also called perimeters, form the outer shell of an FDM print. Wall count and thickness can have a major effect on the final part.
Infill
Infill is the internal structure inside a printed object. The slicer can usually control its density and pattern.
Infill density and pattern
Infill density describes how much of the interior is occupied by the infill structure. An infill pattern describes the shape of that structure. More infill is not automatically the answer to every strength problem; walls, geometry, orientation and material also matter.
Print speed
Print speed describes how quickly the printer moves while depositing material. Higher speed can reduce print time, but delicate geometry and demanding surfaces may require slower movement.
Flow, nozzle temperature and bed temperature
Flow affects how much material is delivered. Nozzle temperature controls the temperature used to process the filament, while bed temperature refers to the temperature of a heated build surface. The correct values depend on the printer, material and setup.
| Term | What it controls | Common effect |
|---|---|---|
| Nozzle size | Material outlet diameter | Detail, flow and potential speed |
| Layer height | Vertical thickness of each layer | Surface appearance, vertical detail and print time |
| Wall count | Outer shell structure | Surface quality and part strength |
| Infill density | Internal structure amount | Material use, print time and internal support |
In short: Layer height affects vertical resolution, while walls and infill determine much of the structure inside and around the printed part.
What are supports, overhangs, bridging, brim and raft?
Overhang
An overhang is a section that extends outward beyond the layer below it. Difficult overhangs can sag when there is not enough material underneath.
Support structures
Support structures are temporary printed structures used to help create difficult geometry. They are removed after printing.
Bridging
Bridging occurs when material is deposited between two supported areas without support underneath the middle. Long bridges can sag depending on the printer, cooling, material and settings.
Skirt
A skirt is a line or group of lines printed around the model without touching it. It can help prime the nozzle and provide a quick check of first-layer extrusion.
Brim
A brim connects to the model's base and extends outward, increasing the area touching the build plate. It can help with first-layer adhesion.
Raft
A raft is a separate printed platform beneath the model. It uses extra material and time but can provide a useful foundation for some prints.
Print orientation
Print orientation is the way a model is positioned on the build plate. Orientation can affect support requirements, visible surfaces, strength and print time.
In short: Supports help difficult geometry, while skirt, brim and raft are tools used around the start and base of a print.
What do FDM, FFF, SLA, resin and filament mean?
FDM and FFF
FDM 3D printing, also commonly called FFF, uses thermoplastic filament deposited through a heated nozzle layer by layer.
Filament
Filament is the solid plastic material supplied to an FDM printer, usually on a spool.
PLA
PLA is a widely used thermoplastic for desktop FDM printing and is common for models, decorative products and many general-purpose prints.
PETG
PETG is another common thermoplastic, often considered when a project needs a different balance of durability and temperature resistance from PLA.
ABS
ABS is a thermoplastic used for functional applications. It generally requires more attention to printing conditions than PLA.
SLA and resin
SLA is a light-based 3D printing process that cures liquid photopolymer resin. Resin printing is often considered for fine detail and smooth surfaces, but it involves different handling and post-processing from FDM.
| Factor | FDM | Resin |
|---|---|---|
| Material | Filament | Liquid resin |
| Process | Heated nozzle extrusion | Light-based curing |
| Common use | Décor, prototypes, models and functional parts | Fine-detail models and small detailed parts |
| Post-processing | Support removal, sanding or painting as needed | Washing, support removal and curing |
In short: FDM uses filament through a nozzle, while resin systems cure liquid material with light. The right choice depends on size, detail, strength, finish and intended use.
What do warping, stringing, elephant's foot and post-processing mean?
Warping
Warping occurs when part of an FDM print lifts or curls away from the build plate. Material behaviour, temperature, cooling and first-layer adhesion can all contribute.
Stringing
Stringing is the appearance of thin unwanted strands between separate sections of a print.
Retraction
Retraction means pulling filament back slightly before a travel move to reduce unwanted extrusion. The appropriate setting depends on the printer and extrusion system.
Elephant's foot
Elephant's foot is when the bottom edge of a print extends outward more than intended, often because the first layers are compressed against the build surface.
Layer lines
Layer lines are the visible marks created by stacked printed layers. Their visibility depends on layer height, geometry, material and finishing.
Delamination
Delamination occurs when layers do not bond properly and sections begin to separate.
Post-processing
Post-processing is the work performed after printing. Depending on the product, this can include support removal, sanding, filling, painting and assembly.
In short: A print can be physically complete when the printer stops, but the final product may still need cleaning, finishing or assembly.
Which 3D printing terms matter when you place a custom order?
You do not need to know every printer setting before ordering a custom print. Start with the information that affects the finished product:
- Dimensions: Give the required final size.
- Material: Explain how the object will be used so the material can be selected appropriately.
- Finish: Specify whether you want a raw printed surface, sanding, painting or another finish.
- Detail: Tell the printer whether fine surface detail is a priority.
- Quantity: One prototype and a bulk production order require different planning.
- 3D file: STL, OBJ or 3MF files are useful when you already have a printable model.
- Intended use: A display statue, school model, prototype, replacement part and personalized gift can require different decisions.
If you need a custom print, you can also see CraftLayer India's 3D Printing Service in Ranchi for custom printing information.
For a product example, see the Lord Shiva Murti.
In short: A good custom-print request does not need to sound technical. Explain what you want to make, how large it should be, what it will be used for, how many you need and how you want it to look.
Frequently asked questions about 3D printing terms
What are common 3D printing terms a beginner should know?
Start with FDM, filament, STL, slicer, G-code, layer height, infill, supports, nozzle, build plate and post-processing. These cover much of the basic conversation around desktop 3D printing.
What is layer height in 3D printing?
Layer height is the thickness of each printed layer. Smaller layer heights can improve visible surface detail but generally increase printing time.
What is infill in 3D printing?
Infill is the internal structure inside a printed part. It can be adjusted by density and pattern, and it works together with walls, geometry, orientation and material to affect the final result.
What is a 3D printer slicer?
A slicer converts a 3D model into printable layers and machine instructions and is where many print settings are selected.
What is G-code?
G-code is a set of machine instructions used by many 3D printers to control movement, extrusion and other printer actions.
What is an STL file?
An STL file is a common 3D model format used in printing workflows. It represents the model's surface geometry.
Is FDM or resin printing more suitable for detailed models?
It depends on the project. Resin printing is often considered for very fine details and smooth surfaces, while FDM can be practical for larger objects, general-purpose models and many functional applications.
Final thoughts
Understanding 3D printing terms makes it easier to choose settings, understand a printer, troubleshoot problems and communicate clearly about a custom project. You do not need to become a printer technician; knowing the difference between a model and a slicer, layer height and nozzle size, or infill and walls is enough to make many printing decisions easier.
When you have a custom idea, the technical side should support the product you want to create. CraftLayer India provides custom 3D printing, personalized statues, miniatures, décor, prototypes and bulk printing services across India.
Ready to turn an idea into a physical product? Share your reference, dimensions or existing 3D model with CraftLayer India and discuss the material, finish and quantity you need.