Formlabs test printing technology for coloring 3D printed objects

One of the main challenges that 3D printing presents to manufacturers and enthusiasts is how to apply color to the surface of a 3D printed object. Produces non-flat complex objects that are difficult to cover with paint or color texture. One way to apply these extra touches to a finished object is called a hydrographic map. Back in 2015, a group of developers came up with a clever way to improve hydrological techniques, using computer modeling to apply more complex textures and color patterns. Although the authors have not yet announced their projects, recent simulations by Blender, a 3D printing company, Formlabs, show the potential of this exciting approach.

According to 3D Tiger, hydrology is a technique that applies a color or texture to a 3D printed object using a viscous coating. The coating was printed onto a 2D film and then sprayed with a fixing solution. This flat PVA film can float on the surface of the water tank. The 3D object is then slowly dipped into the slot, and as it descends, the object is wrapped by the film and leaves its mark on the surface.

This dip-printing process greatly simplifies the coloration of objects with composite curved surfaces and there are few other ways to accomplish this. 3D objects usually have inconsistent shapes, which means that the paint needs to be transferred to them in a non-uniform manner. When the object descends, some areas of the film will stretch more than the other areas, which means that it is not possible to align a particular point of the pattern or texture with a particular point on the object. Therefore, dip printing can only be used to transfer inaccurate repeating patterns, such as camouflage patterns.

The breakthroughs made by software designers at Columbia and Zhejiang University are called computational watermark printing techniques. In 2015, an amazing response was demonstrated at the SIGGRAPH conference, which simulates the actual process of dip printing to produce better 2D film. By predicting how the film will stretch when the 3D object is immersed, a texture map can be printed that allows the pattern to be precisely aligned with the object it is designed to. This means that 3D printed objects can be colored in a way that goes beyond simple customization or decoration, with the possibility of applying precise patterns with different colors to different parts of the object, or recreating different textures across the entire range.

Formlabs uses its Form 23D printer for simulation. The resin canister is reused to form a water tank for immersing the 3D object. The software they use is "forged" by using texture maps of specific shapes. Blender can't model the surface tension of water. Despite these limitations, their experiments are very successful.

The 3D print ball is submerged to produce a surprisingly accurate sphere, and the pattern and texture of the frog's skin faithfully reproduces on its 3D printed copy.

In fact, such an impressive result is achieved by calculating the basic simulation of watermark printing, which is a very promising technology. Developers who want to design this method will eventually release something to the market, so more users can get their technological breakthroughs. Formlabs recommends that the hydrological trough be built into a 3D printer, which will greatly improve the alignment between the 3D object and the 2D film, so perhaps the manufacturer will eventually realize the potential to calculate watermark printing and build hardware that can be more efficiently adapted to production. process. This will be an exciting technology, 3D printing will be able to make different kinds of objects.

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