How Resin Printing Works

3D printing technologies have revolutionized manufacturing and design. One of the most popular 3D printing technologies is resin printing. Resin printing differs from traditional FDM or fused deposition modeling, where plastic layers are built up over time to create a physical object. In resin printing, liquid photopolymer resins are cured under the influence of light to create the desired product.

Despite being a relatively new and complex technology, resin printing has become increasingly more accessible to designers, manufacturers, and hobbyists alike.

What is Resin Printing?

Resin printing, also known as stereolithography, begins with the creation of a 3D model. Designers create digital models using software programs, such as SketchUp or CAD, or they may download pre-made digital models. Once the model is created or downloaded, it is then converted into a file format that can be read by the resin printer. The most common file types for resin printing are STL, OBJ, and AMF files.

Next, the physical object is printed using a resin printer. A liquid photopolymer resin is used as the raw material, and the process involves layering it onto a build platform. The printer creates a layer of the liquid resin over the build platform and then uses a digital projector or UV light source to expose the resin to light. The light triggers a reaction in the resin, causing it to solidify or harden. Once the layer is complete, the printer creates a new layer, repeating this process until the entire object is created.

After the printing process is complete, the finished object must be washed and cured. The initial product has a layer of excess or uncured resin and is therefore not immediately usable. This layer must be removed using a chemical bath or an ultrasonic cleaner. Then, the object is cured or hardened further using ultraviolet light. This curing process ensures that the object is durable and stable.

Types of Resin Printers

There are different types of resin printers available in the market. Two of the main differences are whether the printer uses DLP technology or LCD technology. DLP, or Digital Light Processing, printers use a digital micromirror device to project light into the resin, which eventually turns it into a solid object. LCD, or Liquid Crystal Display, printers use an array of UV LEDs in combination with an LCD screen.

The screen displays the image or model in a high resolution that allows for greater detail and accuracy in the final product. In general, DLP printers are faster than LCD printers, while LCD printers offer greater precision.

Resin printing has allowed for the creation of complex and detailed objects that were previously challenging to produce. People can create products with fine details, such as jewelry, art pieces, and statues, that can be challenging to achieve using traditional manufacturing methods. Moreover, the use of photopolymer resins allows for the possibility of creating very diverse shapes and structures. Resin printing has paved the way for significant improvements in industrial design, engineering, and rapid prototyping.


Resin printing is a remarkable technology that has greatly impacted the field of design and manufacturing. It works by curing liquid photopolymer resin under the influence of light to create complex and detailed products. While there are nuances to the printing process, understanding the basics should give you an idea of how resin printing works. The use of resin printing technology has opened the door to possibilities that were once thought impossible.

Resin printing is here to stay, and we can only expect more significant improvements in the technology as it continues to evolve.

Tyler Woodward

Tyler Woodward

Hi, I'm Tyler! I'm a passionate writer and believer in the potential of 3D printing technology. With my background in engineering and design, I bring an exciting mix of creativity and technical expertise to my writing. In addition, I pride myself on staying up to date with the latest trends in the industry.

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