SLA 3D Printing
SLA resin 3D printing for smooth-surface prototypes, tools, fixtures and molds: ±0.2 mm tolerance to 100 mm, build envelope 189 x 118 x 326 mm, in Loctite 3843 and IND147 photopolymer resins.
Last updated: 2026-10-26
Stereolithography (SLA) builds parts by curing liquid photopolymer resin layer by layer with a laser. Its distinguishing property among 3D printing processes is surface quality: parts come off the build with smooth surfaces that often need no finishing for fit-check, master-pattern and presentation use.
The catalog envelope covers ±0.2 mm up to 100 mm (±0.2% beyond 100 mm) tolerance, a 189 x 118 x 326 mm build volume, and engineering-grade photopolymer resins — Loctite 3843 Matte Black and Loctite IND147 Black. These are not hobby resins: IND147-class materials target tooling, fixtures, molds and functional parts that must survive handling and repeated assembly. Build size is the practical planning unit: larger enclosures split into bonded sections, and the split lines belong on the drawing from the start.
Specifications
| Specification | SLA 3D Printing |
|---|---|
| Tolerance | ±0.2 mm up to 100 mm; ±0.2% beyond 100 mm |
| Max Part Size | 189 x 118 x 326 mm |
Materials
Surface Finishes
Stereolithography (SLA) resin 3D printing service using photopolymer resins such as Loctite 3843 and IND147 for tools, fixtures, molds, and functional parts.
Values above are the collected catalog specification envelope for this product family. Tolerances and lead times at the demanding end of a range are confirmed for the specific geometry, material and batch at quotation.
Applications & Selection Points
Fit-check and presentation models
Enclosure prototypes, ergonomic studies and customer-facing models are SLA's core work: the smooth as-printed surface shows design intent without finishing, and the tolerance band supports assembly-fit validation on housings and covers.
Master patterns for casting
SLA parts serve as master patterns for urethane casting and silicone molding — the surface the master carries is the surface the mold replicates. Smooth masters mean less mold polishing and cleaner cast parts; this is the standard bridge from a digital model to short-run molded parts.
Jigs, fixtures and mold tooling
Assembly jigs, drill guides and short-run mold inserts in IND147-class resin survive shop handling and repeated use. For tooling that contacts real production loads, treat resin choice as a material selection with the supplier — photopolymers vary widely in toughness and temperature capability.
Where SLA is not the process
Photopolymers are not thermoplastics: for load-bearing end-use parts, high or sustained heat, or outdoor UV exposure, SLS nylon or a machined polymer is the more durable route. Use SLA where surface and geometry accuracy lead the requirement list.
Orientation, supports and post-cure
SLA parts print at an angle on supports, and two quality consequences follow: support contact points leave small marks that are placed and finished strategically, and layer staircase appears on shallow slopes. Parts are washed and post-cured after printing, which completes the polymerization and defines the final mechanical behavior — an under-cured part measures softer and scratches earlier. Marking which surfaces are cosmetic lets the build place supports on faces that will be finished or hidden, at no cost to the part.
Frequently Asked Questions
SLA vs SLS — which resin/nylon process for my part?
SLA wins on surface finish and fine feature resolution — it is the choice for visual models, masters and precision fixtures. SLS (nylon) wins on durability and functional testing: no support scars, better chemical and impact behavior, and nested batch builds. A model that must look right prints SLA; a part that must survive use prints SLS. Where a project needs both — a smooth master now and durable end-use parts later — the two processes chain naturally rather than compete.
What accuracy does SLA hold, and how is it measured?
The catalog states ±0.2 mm up to 100 mm of dimension, and ±0.2% beyond 100 mm. Orientation affects where deviation concentrates — layer staircase on shallow slopes, support marks on down-facing surfaces. Mark which surfaces are functional so orientation and support strategy are chosen for those, not for build speed.
What does an SLA quote need?
A STEP or STL model, resin selection (or the application description to select one), quantity, critical surfaces flagged, and delivery country. State the use case — "fixture contacting parts daily" and "presentation model" select different resins and different orientation strategies.
Ordering & Documentation
Documents
3D model plus a note on functional vs cosmetic surfaces. Where the part is a master pattern or tool, state what it will contact (silicone, urethane, wax) — resin release and durability behavior depend on it.
Quotation
Pricing inputs: build volume consumption (nesting with other work can help at quantity), resin, quantity, post-cure and finishing requirements, destination. Tolerance-critical parts should be quoted with inspection stated, not assumed.
Sample & Supply
Single pieces through batch runs; repeat orders against the same model file reproduce directly. For tooling use, a sample part exercised in real service conditions before the batch is the low-cost validation step.
Storage & Shipping
Post-cured photopolymers ship protected like any finished plastic part. Long-term storage considerations: avoid sustained direct sunlight and high heat — photopolymers age under UV. For fixture resins in shop use, periodic inspection for surface wear is cheaper than surprise failure.