Encyclopedia

3D Printing (technology): A generic term for processes that use ink-jet technology to print material in layers. (read more about Objet technology)

Build Envelope (technical term): Measurement of the machines part size limitations given by the X, Y and Z axes.

CAD (technical term): Computer Aided Design. (read more about CAD)

Dura Max White SLA (material): White opaque resin, suitable for general design andCAD validation, presentations, form and fitment and limited functional tests.

Dura Max Clear SLA (material): Semi-transparent material, suitable for general design and CAD validation, presentations, form and fitment and limited functional tests.Lacquering increases the level of transparency.
     

SLA materials are epoxy based and are therefore somewhat brittle.Too much forcewill cause the models to break. In the event this happens, they can be repaired using super-glue. (read more about materials)

Finishes for SLA (finish): Arrk has available four levels of SLA finishes to better serve our customers. These include:
     

1. Concept Finish (3 Days): Light bead blast finish on exterior and interior surfaces. Suitable applications include concept design validation and communication models. Arrkdoes not recommend this finish for painting,fitment purposes oras a master model for secondary tooling,due to the presence ofbuild lines.

2. Engineering Finish (4 Days): Exterior surfaces finished to a high quality. Suitable applications include master model for Rapid Plastic (minimum requirement), presentation models (when interior finish is not critical), fit and form validation.

3. Premium Finish (5 Days): Exterior and interior surfaces finished to a very high quality. Suitable applications include master model for Rapid Plastic, presentation models for photography shoot, exhibition model, fit and form validation.

4. Custom Finish(6 Days): SLA models that needa high level of transparency require a high amount of hand polishing. To improve the level of transparency, lacquering is a good option.

5. Lacquer Finish is applied when clarity is required or parts are going to be placed under water for a short period of time.

Aesthetic Model (type of model): Visual model used for presentation purposes.

Form and Fit Model (type of model): Rapid prototype used to evaluate assembly and basic functional issues.

Functional Model (type of model): Rapid prototype made of materials close to final spec materials that initial testing can be performed on.

Post Processing (technical term): Once a part is completed, each process has certain operations that need to be performed in orderto make the part useable. This mayinclude sanding to remove stair stepping or painting.

Rapid Prototyping (technology): Acronym RP. Builds three dimensional parts from 3D CAD data by layering material. (read more about rapid prototyping)

Resolution (technical term): The minimum feature size that a process can be expected to reproduce. In the X,Y plane it can depend on pixels, laser spot size and mechanical precision. In the Z dimension it depends on the layer thickness.

Selective Laser Sintering (technology): Acronym SLS. A process using photosensitive powders sintered by a laser that traces the parts cross sectional geometry layer by layer. (read more about SLS)

Stair Stepping (technical term): Visual detractor caused because rapid prototypes are made using a layer by layer method with each layer having a finite thickness. Small steps are created on curved surfaces. Reducing the layer thickness helps minimize stair stepping.

Stereolithography (technology): Acronym SLA. A process using photosensitive resins cured by a laser that traces the parts CROSS sectional geometry layer by layer. (read more about SLA)

STL (technical term): The standard file format for all rapid prototyping processes. The extension stands for STereoLithography but the format applies to all major rapid prototyping technologies. (read more about STL files)

Support Structure (technical term): A feature added to a part in some RP methods in order to maintain accuracy while building especially where overhangs or undercuts are seen. The supports are removed after the build is completed.

Tolerance (technical term): Expected tolerances for SLA parts is +/-0.1mm per 100mm (please note these tolerances are applicable to Engineering and Premium Finished models). Expected tolerances for SLS parts is +/-0.25mm up to 150mm and +/-0.2% over 150mm.