What Is 3D Printing?
Author: Domeny.ForSale editorial team Published
In brief: 3D printing is the production of a physical object from a digital model, usually by building it layer by layer. It allows you to create prototypes, functional parts and decorative objects, but their durability and accuracy depend on the technology, material and design. It is not limited to printing with plastic: resins, metals and other materials requiring specialist equipment are also used.
How does 3D printing work?
3D printing is an additive manufacturing method, meaning that an object is created by adding material. This distinguishes it from subtractive manufacturing, such as milling, in which a tool removes material from a larger block. However, a printer does not always have to lay down a single path of material — some machines cure an entire layer at once.
The starting point is a three-dimensional model: a digital description of the object’s shape. It can be designed in CAD software, which is used for technical design, downloaded from a model library or obtained by scanning an object. A scan usually needs to be checked and processed before it is suitable for printing.
The model is then loaded into a program called a slicer. This divides the solid into layers and prepares instructions for the printer, taking into account factors such as the material, part orientation and layer thickness. Once printing is complete, the object may require support removal, cleaning or additional curing.
The most popular technologies and materials
The term “3D printing” covers a range of processes. The choice of technology affects the surface finish, strength, cost and amount of work required after printing.
| Technology | How the object is made | Typical applications |
|---|---|---|
| FDM/FFF | A heated nozzle deposits melted plastic supplied as filament, a thin strand of material | Brackets, enclosures, prototypes, household accessories |
| SLA/MSLA | Light selectively cures liquid resin | Figurines, fine details, models with smooth surfaces |
| SLS | A laser sinters selected areas of polymer powder, often polyamide | Functional parts and complex components ordered from printing services |
Home FDM printers often use PLA, a plastic that is relatively easy to print but not particularly resistant to high temperatures. PETG may be better suited to functional parts exposed to moisture and impacts, but it also has limitations. Check the properties in the data sheet for the specific material rather than relying solely on its name.
Resin printing can produce fine details, but uncured material must be handled carefully. Prints usually need to be washed and given an additional cure according to the manufacturer’s instructions. Metal printing, meanwhile, takes place in specialist systems and is not a straightforward substitute for home printing with plastic.
What is 3D printing useful for?
The biggest advantage of 3D printing is the ability to make a single, customised object without preparing a production mould. This makes it easier to test designs: you can print an enclosure, check the placement of buttons, improve the model and produce the next version. As a result, the cost of changes can be lower than in processes requiring separate tooling.
For example, suppose you need a remote control holder attached to the side of a desk. You measure the remote and the mounting location, design a pocket with a little clearance, then print a short test section to check the fit. Only after adjusting the dimensions do you make the entire holder — this reduces the amount of material wasted on an unsuccessful attempt.
3D printing is also useful for scale models, educational aids, organisers and some replacement parts. However, it is not always cost-effective for simple, mass-produced products: a standard box from a shop may be cheaper and ready to use immediately. The advantage of printing increases when you need an unusual shape or a specific dimension.
What limitations and risks should you consider?
A printed object does not automatically have the same properties as a part that is cast or made from solid material. In FDM in particular, the bonds between layers may be weaker than the material along the deposited paths. The model’s orientation during printing therefore affects not only its appearance but also its ability to withstand loads.
Not every shape can be made without supports, which are temporary structures that hold up parts of the object as it is built. Removing them takes time and may leave marks. Holes, snap-fit connections and mating parts also require allowances for clearances and inaccuracies in the process.
Safety concerns both the operation of the printer and the use of the finished object. When printing plastics, ensure ventilation and follow the manufacturer’s recommendations; when using resins, follow the safety data sheet, including its requirements for skin and eye protection. A statement about the raw material alone does not mean that the finished print is suitable for contact with food. Components for brakes, climbing equipment or medical applications require engineering or specialist assessment, not just a successful print.
How to get started: your own printer or a printing service?
If you need one part, ordering a print is a practical starting point. Prepare a model or a dimensioned drawing and describe the operating conditions to the service provider: load, temperature, contact with water and the accuracy you expect. Ask them to confirm the technology, material and scope of post-processing.
Owning a printer makes more sense if you plan to experiment regularly and are willing to learn about settings and maintenance. Add the costs of materials, tools, ventilation if needed, and failed attempts to the price of the machine. Check the current specifications and workspace requirements in the documentation for your chosen model.
For your first project, choose a small object with no safety-critical function, such as a desk organiser. Write down its required dimensions and conditions of use — this is a better starting point for choosing a technology than the printer’s appearance alone.
See also: What Is 2FA?
Read also
