Stereolithography SLA / Digital Light Projection DLP

Stereolithography is a 3D printing process that uses ultraviolet (UV) lasers to draw out each layer of a 3D Computer Aided Design (CAD) model into a vat of photopolymer liquid resin. The photopolymers are sensitive to ultraviolet light and solidify into a rigid polymer at the points where the laser light comes into contact with it. The process is repeated for each layer of the model.

PrintCity has six Form 2 and two Photocentric Pro Digital Light Projection (DLP) printers that are used to create high-resolution (smooth surface) 3D printed artefacts. DLP uses the same types of photopolymers as SLA but replaces the UV laser with a 4K monitor. The monitor is used to project an entire layer or cross section of the CAD file into the resin and the object is built up and lifted out of the bath one layer at a time.

Benefits of SLA/DLP are very high-resolution parts, down to 25 micron layers, which produce models similar to injection moulded parts.

These models have support structures required to hold models in place. PrintCity has a dedicated post-production facility to assist with this. There is also a range of resins available for specific uses that include dental technology, jewellery and functional parts, as well as finely detailed prototypes.

All CAD models are examined and any issues are discussed prior to printing by a member of our expert staff, to identify the best process for manufacture.

Stereolithography SLA / Digital Light Projection DLP - PrintCity - Manchester Metropolitan University - Facilities and Equipment

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