What is MSLA Printing?

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Masked Stereolithography (MSLA) or Masked SLA (Stereolithography) is a method of VAT photopolymerization where photosensitive thermoset resin is selectively cured layer by layer to construct 3-dimensional parts.

The process starts by importing and orienting 3D models in a specialized MSLA slicer. Once arranged, each model is carefully supported. Printing parameters such as exposure time, resin type and layer thickness are then set before the model/s are "sliced" into a series of cross-sectional 2D masks. The code & images are then generated and can be sent to the printer.

During the printing process, the build platform lowers into the vat of resin, leaving only a single layer between the base of the vat and the build plate. The LCD screen then displays the first image (cross-sectional layer), and a series of UV lamps project light upwards at the masked resin for several seconds before turning off. All unmasked resin is exposed to UV light and will be cured during this time. The build plate is then raised by a single layer, and the LCD image is updated. This process of exposing, raising, and updating continues until all parts have been printed.

The build chamber can then be removed from the printer, supports removed and prints cleaned using isopropyl alcohol. Once all excess uncured resin has been removed, prints are cured once more in a UV chamber before they are ready for collection.