Overview
Stereolithography (SL) is widely recognized as the first 3D printing process. It is an industrial 3D printing process used to create complex models, concepts and prototypes with excellent surface finish and accuracy. It is used for applications like jewelry, dentistry, casting and molds, as it supports high feature resolutions, and detailing.
SLA is a laser-based process that works with photopolymer resins that react with the laser and cure to form a solid in a very precise way. A laser beam is directed in the X-Y axes across the surface of the resin according to the 3D data supplied to the machine (the .stl file), whereby the resin hardens precisely where the laser hits the surface. Once the layer is completed, the platform within the vat drops down by a fraction (in the Z axis) and the subsequent layer is traced out by the laser. This continues until the entire object is completed and the platform can be raised out of the vat for removal.
Because of the nature of the SL process, it requires support structures for some parts, specifically those with overhangs or undercuts. These structures need to be manually removed. In terms of other post processing steps, many objects 3D printed using SL need to be cleaned and cured. Curing involves subjecting the part to intense light in an oven-like machine to fully harden the resin.
Materials
Accura 60
| Tensile Strength(MPa) | Flexural Strength(MPa) | Impact Strength(J/m) | Melting Temperature°C |
|---|---|---|---|
| 58 -68 | 87 – 101 | 15 – 25 | 53 – 55 |
Visijet Clear
| Tensile Strength(MPa) | Flexural Strength(MPa) | Impact Strength(J/m) | Melting Temperature°C |
|---|---|---|---|
| 52 | 43 | 86 | 50 |
Accura Xtreme
| Tensile Strength(MPa) | Flexural Strength(MPa) | Impact Strength(J/m) | Melting Temperature°C |
|---|---|---|---|
| 33 – 44 | 52 – 71 | 35 – 52 | 62 |
Visisjet SL Flex
| Tensile Strength(MPa) | Flexural Strength(MPa) | Impact Strength(J/m) | Melting Temperature°C |
|---|---|---|---|
| 38 | 57 | 22 | 53 |
Accura Cast pro
| Tensile Strength(MPa) | Flexural Strength(MPa) | Impact Strength(J/m) | Melting Temperature°C |
|---|---|---|---|
| 52 – 53 | 82 – 84 | 43 – 49.5 | 51 |
Master copies for vacuum casting and other low volume prototyping techniques
Patterns for investment casting
Functional testing prototypes
Low volume/ limited edition products especially for complex geometries
Visual prototypes for photo shoots and market testing
Dental/ jewelry/ art and other sectors which require high detailing and finish
Minimum Wall thickness : 0.8 mm
Minimum details size : 2 mm (for text/ hole diameters etc)
Layer thickness : 0.05 mm – 0.1 mm
Max dimensions : 650 x 650 x 450 mm
Standard Accuracy : ± 0.2% (with lower limit on ± 0.2 mm). Dimensions tend to change with exposure to direct sunlight or another UV source
Lead Time : Minimum 2 working days for despatch
Surface finish : Smooth, with tiny visible layers.
Basic : Support Removal, Sanding, Smoothing
Add on : Primer, Coating / Painting