Stereolithography (SLA) Resin 3D Printing Service
Start A New SLA Quote
STEP | STP | SLDPRT | IPT | PRT | SAT files
- All uploads are secure and confidential.
How Does SLA 3D Printing Work?
The SLA machine begins drawing the layers of the support structures, followed by the part itself, with an ultraviolet laser aimed onto the surface of a liquid thermoset resin. After a layer is imaged on the resin surface, the build platform shifts down and a recoating bar moves across the platform to apply the next layer of resin. The process is repeated layer by layer until the build is complete.
Newly built parts are taken out of machine and into a lab where solvents are used to remove any additional resins. When the parts are completely clean, the support structures are manually removed. From there, parts undergo a UV-curing cycle to fully solidify the outer surface of the part. The final step in the SLA process is the application of any custom or customer-specified finishing. Parts built in SLA should be used with minimal UV and humidity exposure so they don’t degrade.
SLA Design Guidelines and Capabilities
Lorem ipsum dolor sit amet, consectetur adipiscing elit. Ut elit tellus, luctus nec ullamcorper mattis, pulvinar dapibus leo.
Our basic guidelines for stereolithography include important design considerations to help improve part manufacturability, enhance cosmetic appearance, and reduce overall production time.
Stereolithography Materials
ABS-Like White (Accura Xtreme White 200) is a widely used general purpose SLA material. In terms of flexibility and strength, this material falls between molded polypropylene and molded ABS, which makes it a good choice for functional prototypes. Parts as large as 29 in. x 25 in. x 21 in. can be built with ABS-Like White so consider it a primary option if you require an extensive part size build envelope.
Primary Benefits
- Durable, general purpose resin
- Accommodates extra-large parts
ABS-Like Gray (Accura Xtreme Gray) is a widely used general purpose SLA material. In terms of flexibility and strength, this material falls between molded polypropylene and molded ABS, which makes it a good choice for functional prototypes. ABS-Like Gray offers the highest HDT of the ABS-like SLA resins.
Primary Benefits
- Durable, general purpose resin
- Highest HDT of the ABS-like SLA resins
ABS-Like Black (Accura 7820) is a widely used general purpose material. Its deep black color and glossy up-facing surfaces in a top profile offer the appearance of a molded part, while layer lines may be visible in a side profile. Accura 7820 also has low moisture absorption (0.25% per ASTM D570) so that parts are more dimensionally stable. Compared to other SLA materials, it has midrange values for all mechanical properties.
Primary Benefits
- Low moisture absorption
- Glossy cosmetic appearance
ABS-Like Translucent/Clear (WaterShed XC 11122) offers a unique combination of low moisture absorption (0.35% 0.25% per ASTM D570) and near-colorless transparency. Secondary operations are required to achieve functional part clarity, and the part will also retain a very light blue hue afterward. While good for general-purpose applications, WaterShed is the best choice for flow-visualization models, light pipes, and lenses.
Primary Benefits
- Lowest moisture absorption of SLA resins
- Functional transparency
MicroFine is a custom formulated material available in gray and green that is exclusive to Protolabs. This ABS-like thermoset is printed in Protolabs’ customized machinery to achieve high resolution features as small as 0.002 in. MicroFine is ideal for small parts, generally less than 1 in. by 1 in. by 1 in. In terms of mechanical properties, MicroFine falls in the mid-range of SLA materials for tensile strength and modulus and on the low end for impact strength and elongation.
Primary Benefits
- Produces highest resolution parts
- Ideal for extra-small parts
PP-Like Translucent White (Somos 9120) is the most flexible SLA option outside of Carbon RPU 70 and FPU 50. In direct comparison to the average values of an injection-molded polypropylene, 9120 has similar tensile strength, tensile modulus, flexural modulus, and impact strength. The only departure from molded PP is its elongation value, which is only 25% of the molded thermoplastic.
Primary Benefits
- Semi-flexible
- Translucency
PC-Like Advanced High Temp (Accura 5530) creates strong, stiff parts with high temperature resistance. A thermal post-cure option can increase HDT as high as 482°F at 0.46 MPa loading. Accura 5530 has the highest E-modulus of all the unfilled SLA materials, and it is known for being resistant to automotive fluids. However, the thermal curing process does make Accura 5530 less durable, resulting in a 50% reduction to elongation.
Primary Benefits
- High elastic modulus
- Higher resistance to heated fluids
PC-Like Translucent/Clear (Accura 60) is an alternative to the general purpose ABS-like materials and WaterShed XC 11122 when stiffness is desired. Like WaterShed, this material can be custom finished to achieve functional transparency with secondary processing. Accura 60 has the highest tensile strength of and elastic modulus compared of all SLA materials outside of the Advanced High Temp options that are most often thermal cured.
Primary Benefits
- High stiffness
- Functional transparency
Ceramic-Like Advanced HighTemp (PerFORM) exhibits the highest tensile strength and E-modulus making it the stiffest performance material of the SLA materials. When the thermal cure option is applied to parts made from PerFORM, it exhibits the highest HDT (as high as 514°F at 0.46 MPa loading) of the SLA materials.
Primary Benefits
- Stiffest SLA resin
- Highest HDT of SLA resins
True silicone is 100% pure silicone that is available in different shore-A hardness as detailed below. The material is suitable to produce both functional prototypes and end-use products. The material shows high resistance to harsh environments conditions, various acids, bases and nonpolar solvents.
These figures are approximate and dependent on a number of factors, including but not limited to, machine and process parameters. The information provided is therefore not binding and not deemed to be certified. When performance is critical, also consider independent lab testing of additive materials or final parts.
Surface Finish Options for SLA Parts
Supported surfaces will undergo light sanding with 220 or 320 grit sandpaper, followed by media blasting to achieve a uniform matte finish.
Supported surfaces will be lightly sanded with 220 or 320 grit sandpaper for improved surface quality. Sanding scratches will be visible on supported surfaces.
Supported areas may show small grid-like dots or surface blemishes as a result of support removal.
HYmoldplastic offers a variety of SLA finishing services such as sanding, polishing, painting, thermal processing, and plating to cater to your specific requirements.
Applications of Stereolithography (SLA) 3D Printing
Concept Models
The speed, accuracy, and excellent surface finish of SLA parts enable product developers to capture physical snapshots of their designs during the iterative process.
Rapid Prototyping
SLA prototyping is a fully-functional prototype whose materials can simulate polypropylene, polycarbonate, ABS, and rigid composites.
Direct Digital Manufacturing
The high accuracy and consistency of SLA render it an ideal approach to fabricating large quantities of discrete or customized parts.
Let’s Build Something Great, Together