Holocreators Blog

On the Holocreators Blog, you will find posts about 3D-scanning and reverse engineering. Post topics range from explanations and tutorials to art projects. We illuminate topics from various angles, often with video.
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In e-commerce, product returns and conversion rates are crucial. 3D models better communicate the product to the customer, making the shopping experience more exciting and the online shop more efficient. For a 3D online shop, 3D models of all products are needed. These can either be 3D modeled from scratch or created more cost-effectively and truer-to-life with 3D scanning.
We combine the advantages of photogrammetry and 3D CT scanning (computed tomography) to create a highly accurate color 3D scan. Photogrammetry provides the best possible color information, while computed tomography allows us to 3D-scan the object with unparalleled accuracy. Subsequently, the 3D scan data from both techniques are merged.
We created a 3D-printed 3D zoetrope to show the blossoming process of a flower. A real lily was 3Dscanned at various stages of bloom. From these 3D scans, we created a 3D animation. From the 3D animation, we 3D printed 15 lilies and arranged them on a round plate. We illuminated the rotating plate with a strobe light to create the illusion of blossoming lilies.
Wire EDM is a process for cutting metal. It is used to cut metal 3D prints from their base plate. When 3D printing on metal, the printed part becomes one with the base plate on which it is printed. To separate the two without damaging the part, a precise cutting process is needed. This is where wire EDM shines.
SLM is a 3D printing process in which metal powder is fused by laser, creating a new object layer by layer. SLM stands for (Selective Laser Melting), which means that the laser selectively melts the metal powder only where the solid material is needed. In the end, the finished object can be removed from the powder bed.

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    The Artec Space Spider is a handheld 3D scanner. The cameras on the front look like spider eyes— hence the name "Spider". The 3D scanner is very light and works with blue-structured light. It was developed primarily for 3D scanning smaller objects of between 5 and 30 cm. The manufacturer states the accuracy of the 3D scanner to be within 0.1mm-0.05 mm. Currently, the Artec Space Spider lists for about 20,000 Euro (23,626 USD).
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    With the help of specialized 3D scanners, you can 3D-scan people and animals. This allows you to create 3D models that can be 3D-printed or used for 3D animation. We'll show you three different devices that make such 3D scans possible.
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    Reverse engineering enables us to create a copy of an object. For this purpose, the part is 3Dscanned, then the 3D scan data is converted into a CAD format, and finally, the part is manufactured. All these steps result in noticeable deviations. If an error adds up over multiple steps, then we call this error propagation.
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    A NURBS model consists of points connected by curves. A polygon mesh consists of thousands or millions of small triangles. CAD surface models are usually created using NURBS surfaces, while 3D scans are typically exported as a polygon mesh. The conversion from a polygon mesh to a NURBS model is called "reverse engineering".
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    There is a niche field of forensics that deals specifically with crimes committed with firearms. Forensic ballistics, as this field is known, uses forensic techniques to analyze crimes perpetrated using firearms. The 3D scanner Alicona InfiniteFocus can be used for forensic ballistics. We made our way to Braunschweig to the company “a3Ds” to show how this can be done. By comparing 3Dscanned fired cartridges, we can match them to the rifles that fired them.
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    We perform a deviation analysis in metrology to compare two 3D models with each other and to document the differences with a false color comparison. The analysis is mainly used in quality assurance to document reverse engineering deviations from the original 3D scan. If we compare the CAD data (nominal state) of a part with the 3D scan (actual state) of the same part, this is called a “nominal actual comparison”.

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