There are two kinds of photocurable 3D printing technologies, namely DLP? Printing technology and? SLA？ Printing technology. The most important difference between these two 3D printing technologies lies in the way they emit light to the photosensitive resin of printing materials.
What is photocurable 3D printing technology? Its principle is to print and shape articles layer by layer. As for the printing material used, it is different from the roll of glue line printed by FDM 3D. The printing material used in photocurable 3D printing is liquid photosensitive resin. This photosensitive resin will react with light and cure. Curing 3D printing is to print a solid model by shining light on liquid photosensitive resin. In terms of accuracy, the objects printed by photocuring technology are more detailed than those printed by FDM or other printing technologies, and are suitable for making fine models, such as jewelry prototypes and fine parts.
DLP (direct light processing) light curing 3D printing built-in light projector. DLP printers use projectors to project light onto the photosensitive resin of printed materials to cure the resin. Because of cascade printing, 3D models will be cut into layers by 3D printing software, and then DLP will be used. Our projector projects the shape and pattern of the first layer of 3D model onto the liquid photosensitive resin layer by layer, so that the photosensitive resin is solidified and molded. After the first layer is printed, the printing platform will rise, so the printed object will also rise at the same time, and then the projector will project the shape and pattern of the next layer of 3D model onto the photosensitive resin, so that the object will be printed and shaped through repeated cascade printing. It is worth mentioning that when printing, the printed object is printed in reverse, which is different from FDM? Printing technology. Because DLP uses a projector to illuminate a single image of each layer on the printing platform, the image of each layer is made up of tiny squares called pixels.
As for SLA (Stereolithography) 3D printing technology, it does not use light projector, but uses laser to irradiate liquid photosensitive resin, which will be cured layer by layer, and finally get the shape of the whole object. SLA photocures 3D printing, when emitting laser, will not be able to shoot a whole layer of 3D model patterns like DLP machine. The laser is irradiated on the liquid resin point by point to form a solidified layer. SLA？ The main components of light-cured 3D printer are similar to DLP printer, including a lifting printing platform. When the first layer of photosensitive resin is cured, the platform will rise a certain distance, and then the second layer will be printed by laser, and so on, layer by layer, and finally printed into an overall shape. Another container is filled with liquid photosensitive resin. In addition, SLA uses two frictions, one on the X axis and the other on the Y axis. Rubs will aim the laser at the specified printing coordinates and let the resin in that place solidify and form. Through 3D slicing software, the 3D model is analyzed into a series of points and lines with different coordinates, and SLA will accurately hit the laser on the printing material liquid resin according to the coordinate path.
Due to SLA and DLP? Light-cured 3D printing has different light projection methods, so SLA printing takes a little longer, especially when printing large objects, the printing time of DLP light-cured 3D printing will be much shorter. However, in the aspect of relative printable area, because DLP is projected, the relative printable area is no problem, and SLA is not affected by projection, so the printable area is not limited.