Imagine you need to reproduce a part that\u2019s no longer made, make an exact copy of a sculpture or create a digital model of a complex object. Modelling it by hand from scratch is slow, expensive and not always accurate. This is where 3D scanning<\/strong> helps \u2014 a technology that turns a real physical object into a digital 3D model in a matter of minutes.<\/p>\n The result of a scan is a three-dimensional mesh model (usually in STL or OBJ format) that can be sent straight to 3D printing<\/a>, refined in a CAD program or used for visualisation. It\u2019s a bridge between the physical and digital worlds, and today it\u2019s available not only to industrial companies but to ordinary users too.<\/p>\n There are several main 3D scanning technologies, each with its own strengths. The choice depends on the size of the object, the accuracy required and the budget.<\/p>\n A laser beam is projected onto the object\u2019s surface, and a camera records its deflection to build a three-dimensional map. These scanners offer high accuracy (up to 0.05 mm)<\/strong> and work well with parts of complex geometry. They\u2019re used mainly in industry, reverse engineering and quality control. The downside is the high cost of the equipment and sensitivity to shiny or transparent surfaces.<\/p>\n Instead of a laser beam, a grid of stripes or dots is projected onto the object, and a camera analyses how it deforms. This is faster than laser scanning because a large area of the surface is captured at once. Accuracy ranges from 0.1 to 0.01 mm<\/strong> depending on the scanner model. Ideal for medium-sized objects: mechanical parts, sculptures, jewellery. Popular budget models are Revopoint and Creality Scan.<\/p>\n This is a method of building a 3D model from a series of photos of the object taken from different angles. Special software analyses the common points in the images and reconstructs the geometry and surface texture. The main advantage is that you don\u2019t need a special scanner<\/strong>. An ordinary camera or even a smartphone is enough. Accuracy is lower than with laser scanners but quite sufficient for many tasks.<\/p>\n The most accessible way to digitise an object is to use your smartphone. Modern phones have good enough cameras, and some models (iPhones with LiDAR, Samsungs with a ToF sensor) also have depth sensors, which greatly improve the result.<\/p>\n Here are three free apps worth starting with:<\/p>\n Tips for good smartphone scans:<\/strong> provide even, soft lighting without harsh shadows, move around the object slowly and steadily, take shots with at least 60\u201370% overlap, avoid shiny and transparent surfaces (they can be treated with a matting spray), and always start with small, stationary objects.<\/p>\n Even a good scan is rarely ready to print straight away. Typical problems: holes in the mesh, scanning artefacts, extra geometry, the wrong orientation or far too many polygons. Before sending it for printing, the model needs to be \u201crepaired\u201d<\/strong> \u2014 this process is called mesh repair.<\/p>\n The main tools for preparing a scan:<\/p>\n After processing, save the model in STL format \u2014 the standard for 3D printing. Read more about file requirements in our article how to prepare an STL file for printing<\/a>. And if you\u2019d rather create a model from scratch than scan one, take a look at the guide how to create a 3D model<\/a>.<\/p>\n The most common use is digitising a part that has broken or worn out. Scanning captures the exact geometry of the original, even if no drawing exists. This is especially valuable for old cars, rare machinery and industrial equipment<\/strong>, where spare parts were discontinued long ago. The scanned model can be refined \u2014 for example, by reinforcing a weak spot or changing a mount \u2014 and an improved version printed.<\/p>\n 3D scanning people is a popular choice for gifts and souvenirs. By scanning a face or a whole figure, you can create a personal bust, a miniature figurine or even a chess set<\/strong> with portraits of real people. Smartphone photogrammetry copes well with this task, although structured light is better for facial detail.<\/p>\n Scanning buildings, reliefs and architectural features makes it possible to create accurate scale models<\/strong> for presentations, museums or restoration projects. Drone photogrammetry digitises even large structures effectively. It\u2019s also an important tool for preserving cultural heritage \u2014 digital copies of architectural monuments are immune to time.<\/p>\n Scanning parts of the body (feet, hands, head) makes it possible to produce individual orthopaedic devices, protective covers and ergonomic accessories<\/strong>. Printing from a scan ensures a perfect fit that mass-produced items can\u2019t achieve.<\/p>\n If the object is too large, high accuracy is needed or you don\u2019t want to spend time on processing, we\u2019ll tell you who can scan the object or make a model from photos and measurements. We\u2019ll prepare the finished file for printing and choose the best material; printing usually takes 1\u20133 days.<\/p>\nTypes of 3D scanner: which to choose?<\/h2>\n
Laser scanners<\/h3>\n
Structured light scanners<\/h3>\n
Photogrammetry<\/h3>\n
Smartphone photogrammetry: 3D scanning for free<\/h2>\n
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Preparing a scan for 3D printing<\/h2>\n
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Where 3D scanning is used: practical examples<\/h2>\n
Reverse engineering and copying parts<\/h3>\n
Portrait busts and figurines<\/h3>\n
Architectural models and heritage preservation<\/h3>\n
Orthopaedics and individual products<\/h3>\n
What if you can\u2019t scan it yourself?<\/h2>\n