Stereolithography (SLA) is a 3D printing technique that uses a UV laser to solidify liquid photopolymer resin layer by layer. SLA offers highly accurate parts and was invented in 1988. The SLA process works by using a laser to trace each layer's shape from a CAD file in the liquid resin vat. Once a layer is cured, the build platform lowers and the next layer is traced on top. When complete, the part is removed and excess resin rinsed away. SLA resins come in many varieties for different applications like prototypes, end use parts, medical models, and more. SLA provides highly detailed prints quickly from CAD data.

1. STEREO LITHOGRAPHY Apparatus’s
NAME : JOGA YOGESH
REG NO :
170101161037@cutm.ac.in
3d PRINTING

2. Stereolithography (SLA)
SLA is one of the most widely used industrial 3D Printing technologies in use today. SLA offers highly accurate
and detailed polymer parts in over 28 different resins. SLA was invented by Charles Hull and introduced to the
market in 1988 by 3D systems.
An SLA machine uses a highly focused UV laser to trace out successive cross-sections of a 3D CAD file in a vat
of liquid photopolymer. As the laser traces the layer, the polymer solidifies and the excess areas stay as a liquid.
When a layer is finished, a leveling blade is moved across the surface to smooth it before solidifying the next layer.
The platform is lowered by a distance equal to the layer thickness (typically 0.004-0.002 in), and a subsequent
layer is formed on top of the previously completed layers. This process of solidifying and smoothing is repeated
until the build is complete.
Once the part is completed, it is raised above the build vat and drained. Excess polymer is rinsed away from the
part surfaces. A final cure is done by placing the part in a UV oven. After the final cure, supports are removed and
surfaces are polished, sanded or otherwise finished.
Stereolithography (SLA)

3. WORKING & FORMATIONS (SLA)

4. Materials
The liquid materials used for SLA printing are commonly referred to as "resins" and are
thermoset polymers. A wide variety of resins are commercially available and it is also possible to
use homemade resins to test different compositions for example. Material properties vary
according to formulation configurations: "materials can be soft or hard, heavily filled with
secondary materials like glass and ceramic, or imbued with mechanical properties like high heat
deflection temperature or impact resistance].
It is possible to classify the resins in the following categories:
Standard resins, for general prototyping
Engineering resins, for specific mechanical and thermal properties
Dental and medical resins, for biocompatibility certifications
Castable resins, for zero ash-content after burnout
Stereolithography Materials
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5. STEREOLITHOGRAPHY RESINS ARE WIDELY USED FOR:
Prototypes for form/fit
Prototypes for functional testing, including snap fit
Master patterns
Investment casting patterns
Injection molds / direct tooling
Wind tunnel testing models
PERFORMANCE CHARACTERISTICS:
Produces highly accurate prototypes quickly from CAD data
Utilized in an additive fabrication process
Offers high durability for functional prototypes
Outstanding water and humidity resistance
Grades available to simulate thermoplastics such as: TPE (thermoplastic elastomer),
PE (polyethylene), PP (polypropylene), ABS
RESINS & CHARACTERISTICS

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1 Resins for automotive and motorsport prototypes
The automotive and motorsport industries are under greater pressure than ever to lower design and
production costs and work in a more sustainable way. stereolithography (SL) solutions enable you to take
your prototyping to the next level creating safer, better designs with speed and accuracy. We know that
speed the ability to get quality products to market faster than competitors
Resins for consumer goods prototypes
From furniture to sporting goods, designers are constantly looking for new ways to improve results. so that
designers can use this fast, precise technology to introduce products into stores faster. The consumer
goods industry has a wealth of applications, and a constant need to innovate and get products into the
marketplace.
Furniture– designs are ever evolving. Somos® materials produce high-quality customized furniture and
models in days instead of weeks—or months.
Sporting goods– equipment requires cutting-edge design to provide athletes with a competitive advantage
in their sport. To get lighter, better-performing gear, we know that designers need to develop more efficient,
streamlined concepts to optimize performance. That’s why are used for functional testing, rapidly turning
ideas into reality.
USES OF RESINS

7. Medicals
Stereolithographic models have been used in medicine since the 1990s, for creating
accurate 3D models of various anatomical regions of a patient, based on data from computer
scans. Medical modelling involves first acquiring a CTR,MRI or other scan. This data consists
of a series of cross sectional images of the human anatomy. In these images different tissues
show up as different levels of grey. Selecting a range of grey values enables specific tissues
to be isolated. A region of interest is then selected and all the pixels connected to the target
point within that grey value range are selected. This enables a specific organ to be selected.
This process is referred to as segmentation. The segmented data may then be translated into
a format suitable for stereolithography. While stereolithography is normally accurate, the
accuracy of a medical model depends on many factors, especially the operator performing the
segmentation correctly. There are potential errors possible when making medical models
using stereolithography but these can be avoided with practice and well trained operators.
MEDICALS

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The most accurate and detailed models
Ability to build large parts – up to 59 x 30 x 22 inches
Many resins available including high temperature and clear materials
Fast print speed / Very little wasted support material
Very good surface finish
Benefits of SLA 3D Printing

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Applications for SLA 3D printing
Appearance models
Prototypes
End use parts
Clear parts
Medical models / Fixtures

10. THANK YOU…
Presented By:
Joga Yogesh