使用 True Cast Resin

True Cast Resin 可用于精致珠宝的精密铸造以及厚度达 5mm 的复杂工程组件制造。True Cast Resin 打印的部件细节出色，表面光滑，广泛适合各种铸造工作流程和条件。

True Cast Resin 性能可靠、质量上乘、用途广泛，可适配多种燃尽时间表。低热膨胀、收缩极小、灰分含量仅为 0.03%，确保了燃烧过程充分、洁净，始终如一地提供出色的铸造效果。

True Cast Resin 以 25 微米和 50 微米的打印层厚进行打印。如需获取该材料的打印技术交流，请加入 Facebook 上的 Formlabs 珠宝/铸造群组。

True Cast Resin 含有蜡成分，在室温下会逐渐固化。这是 True Cast Resin 的正常特性，并不代表树脂过期。

为防止树脂成分分离，Formlabs 建议每周或按需对料盒中的树脂进行加热处理。请选择以下任一加热方案：

• 将树脂盒或树脂瓶放入 45°C 的低温烘箱中一小时。
• 将树脂盒或树脂瓶放入防水袋中，浸入 45°C 水浴中一小时。

• 将树脂盒或树脂瓶放入树脂/丝材加热器中，以 45°C 加热 30－60 分钟。
• 仅限第三方树脂瓶：将树脂瓶放入微波炉中加热 30 秒。

树脂加热后，请用力摇晃树脂盒或树脂瓶 30 秒，让蜡质成分与树脂充分融合。经加热的树脂粘度较低易造成污染，请小心操作。

Formlabs 不建议对已在 Formlabs 树脂槽中的 True Cast Resin 重复加热。打印机在预打印过程中加热树脂槽时，树脂会变稀并液化。对于第三方树脂槽，用户可能需要在非打印期间从树脂槽中取出 True Cast Resin，防止蜡质成分凝固。

铸造既是一种工艺技术，也是一种艺术形式。为了成功得到铸造部件，铸件的设计与材料属性同样重要。应注意每个特征的设计、包埋材料流动和打印配置。参阅 Formlabs 的白皮书珠宝 3D 打印：基础设计参数、支撑与定向 [EN] [DE] [FR] [IT] [ZH]，进一步了解有关珠宝普遍特征，如爪镶、银线细工、雕刻、表面、突出文字、珠边的最佳设计参数。

打印特征建议

使用 True Cast Resin 打印时，Formlabs 建议将模型壁厚设计在 500 微米到 5 毫米之间。

选择铸造树脂时，应综合考虑不同材料的铸造性能。对于较小的部件或细工丝线，建议选用 Castable Wax Resin。对于轻奢型至奢华型珠宝或小型工程组件，建议选用 True Cast Resin。对于大型熔模铸造，建议选用 Clear Cast Resin。

避免熔模断裂

Sprues

Print sprues directly on the model to reduce waxing time and reduce the number of supports. During the CAD design phase, add a sprue joining the part to the wax tree with a single point of connection. A self-supporting model with a hollowed-out main tree can fully eliminate the need for additional supports.

Printing with Formlabs printers

Before printing with True Cast Resin, either on a Formlabs printer or a third-party printer, be sure to heat the resin cartridge or resin bottle if it has been sitting at room temperature for more than a week.

Install or update PreForm, then set up the next print job.

To prepare a model for printing in PreForm:

1. Open a model.
2. Select the resin, resin version, and the desired layer thickness.
3. Orient your models.
   • Rings and other similar small parts: Orient vertically to minimize support touchpoints.
   • All other models: Follow Formlabs best practices for orienting parts. Orient the model 30–45 degrees relative to the build platform.
4. Generate supports.
   • Formlabs recommends turning off internal supports on latticed parts, as they may interfere with the lattice structure.
   • Use internal sprues and supports to prevent two thin features from merging and creating wishbones.
   • Make sure any overhangs or joins are sufficiently supported.
5. Send the print job to the printer.

If the resin cartridge has been sitting at room temperature for over a week, warm the resin cartridge and shake to ensure the resin is mixed completely.

Printing with third-party printers

True Cast Resin is compatible with most third-party resin 3D printers. Formlabs recommends using the recommended print settings for third-party printers.

Design self-supporting models that are large enough to fully resolve. Formlabs recommends using spherical support settings on Lychee and Chitubox.

Chitubox

Lychee

Parts printed in True Cast Resin turn a dark purple when rinsed in solvent and lighten to a pale lavender color when dried. The color does not affect the burnout or final casting of the part, but may indicate how clean the part is of solvent. Larger parts with internal cavities may not dry evenly, leaving parts with a marbled color effect.

True Cast Resin color change is not always uniform, especially for thick parts or when parts cannot be dried completely with compressed air. The color change does not affect the castability of the part as long as it is fully cleaned and cured.

The Form Wash and other washing systems agitate the solvent bath and remove parts from the bath after a set time. Wash parts according to the support article for your device. Formlabs recommends removing supports with a high-quality flush cutter to avoid tear-outs after the first wash. Spray or rinse parts with fresh solvent before drying.

If the model is hollow or has internal channels, ensure liquid resin is flushed out thoroughly from these features. Dry the parts thoroughly with compressed or forced air after removing from the solvent bath. Allow parts to fully dry before post-curing.

True Cast Resin does not require post-curing, although Formlabs recommends post-curing to reduce defects during the casting process. Refer to instructions for your particular machine for appropriate recommendations:

• Form Cure (1st Generation) time and temperature settings
• Form Cure (2nd Generation) time and temperature settings
• Form Cure L time and temperature settings

Sand down remaining touch tips with 1000 grit sandpaper after post-curing.

Parts printed in True Cast Resin do not require a specialized burnout schedule. Follow the recommended process for general casting in your desired investment material. Printed parts are shelf-stable and can be cast up to six months after printing without experiencing shrinkage.

For detailed information on casting with Formlabs resins, read the application guide Introduction to casting with Formlabs resins [EN] [DE] [ES] [FR] [IT] [JA] [ZH] and other Formlabs resources. For peer support for printing with this material, join the Formlabs Jewelry/Casting group on Facebook.

Below is a sampling of prints and castings that have worked well for other customers using different printers, investments, burnout schedules, metals, casting machines, and cleanup methods.

• True Cast Resin safety data sheet (SDS)
• Recommended print settings for True Cast Resin on third-party printers
• Introduction to casting with Formlabs resins
• Introduction to Casting for 3D Printed Jewelry Patterns [EN] [DE] [ES] [FR] [IT] [JA] [ZH]
• Jewelry 3D Printing: Basic Design Parameters, Supports, and Orientation [EN] [DE] [FR] [IT] [ZH]