Cast Resin user guide
Shake the bottle and mix the resin in the vat before start printing!
1. Introduction
This guide is for both Cast Purple, Cast True Blue and Cast Royal Blue.
Cast is an affordable castable resin designed for lost wax method. Below is the recommended print setting, cleaning, curing and burn out recommendation.
We like to thank many users, including VOG (https://www.youtube.com/watch?v=7MDl6ZeTrME), for helping us make the great user guide video and helping each other print and cast well.
The shelf life of the resin is 2 years.
Even if it can be stored for such a long time, we still recommend that you use it in half a year.
UV Resin is a liquid sensitive to temperature, light, and time. Long-term storage will cause the components and pigment of the resin to precipitate and separate.
Please note:
Cast True Blu has dye and wax material that does not settle. however, the wax material will leak out of the print after printing. This will create a partially milky blue visual. This is perfectly normal.
Picture by BBS Metalworks
2. Before Printing
The ideal printing temperature for Cast resin is between 25-35C (resin temperature).
Cast is designed for MSLA printer in mind. It can work in DLP and laser SLA printer but you would need FEP film based vat. Since it is mostly for small jewllery, use the smallest build volume printer for printing
3. Print setting
- Best print with recommended support setting, see below
Please download profiles base for Elegoo, Anycubic, Phrozen, Peopoly, EPAX, Creality here: Click here to download profiles
Please Keet Lift Speed under 50mm/min for Cast resin no matter what printer you use.
4. Cleaning and Dry
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Pre-cleaning preparation |
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Cleaning Step |
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| Dry Step |
After cleaning： Remove alcohol with a hair dryer or air blower until touch completely dry. If using oven, dry about 5 minutes, complex parts can add about 1-2 minutes. （This method is more recommended because it dries more thoroughly.） |
| Check After Dry |
After drying, all you need to do is check if the print is clean. If it is not clean, you may find: 1. The surface of the print is sticky when you touch it 2. There are shiny spots on the surface of the print Then repeat the cleaning and drying steps and check again. |
| Notes* |
1. Moisture will affect the casting results. Dry as quickly as one can once the print is cleaned to avoid the prints absorbing moisture. Cause Resin Prints Absorb Water So Do Castable Resin Prints！ 2. AVOID USING WASH AND CURE ALL IN ONE MACHINE! Some low-cost all-in-one machines are difficult to clean and cure completely, it may affect the casting. 3. For complex part with lots cavities, it may be a good idea to clean/dry multiple times. |
5. Post Curing
Note before proceeding:
- Make sure the print is completely dry cause moisture will affect the casting results.
- It is important to fully cure Cast to ensure clean burnout.
- AVOID USING WASH AND CURE ALL IN ONE MACHINE！
Post-curing steps:
- Curing time varies with light fixture, but at least 10 minutes for simple and smaller ring pieces.
- Please add 5 minutes of curing time for complex or larger prints.
Check after curing：
- Fully Cured Print Should feel hard and a bit brittle
We have tested and proved that Glycerin is not needed in the post-curing process. Please refer to our blog for more details. View Here
6. Investment and burnout recommendation
| Investment | Investment Link | Recommended Burn out schedule |
| Plasticast® investment by Ransom & Randolph （Professional user tested） | https://www.ransom-randolph.com/plasticast | https://www.ransom-randolph.com/_files/ugd/cc5f22_902ad781b4e74bf3b3d55bff34f7fe6c.pdf |
| CLASSIC™ by SRS （Recommended by Professional Caster VOGMan） | https://www.srs-ltd.co.uk/products/investment-powder/classic | https://www.srs-ltd.co.uk/products/investment-powder/classic |
In addition to the above casting schedule, we have another 6-hour burning schedule provided by David Collinson that we have tested and proven to work.
A Tip for Burning: Preheat your furnace to 50C before placing the kiln inside for optimal results.
| Time (Hour) | Temperature |
| 0 | 122℉ (50℃) |
| 1 | 300ºF (150℃) |
| 2 | 700ºF (371℃) |
| 3 | 1350ºF (732℃) |
| 4 | 1350ºF (732℃) |
| 5 | 1350ºF (732℃) |
| 6 | 950ºF (510℃) |
7. Specific Gravity
Casting resins and waxes have a Specific Gravity of 1, whereas gold…
Gold and Silver Specific Gravity
| Gold | Type | S.G. |
| 24k | Gold | 19.32 |
| 18K | Green | 15.9 |
| 18K | Yellow | 15.58 |
| 18K | White | 14.64 |
| 18K | Red | 15.18 |
| 14K | Yellow | 13.07 |
| 14K | White | 12.61 |
| 14K | Red | 13.26 |
| 10K | Green | 11.03 |
| 10K | Yellow | 11.57 |
| 10K | White | 11.07 |
| 10K | Red | 11.59 |
| Silver | 10.49 |
Three ways to calculate Metal Weight for Casting (Gold as an example)
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Important densities:
Cast resin density: 1.1 grams per milliliter (g/ml)
Gold density: 19.32 grams per milliliter (g/ml)
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Method 1: Using slicer volume estimate
Get the volume of your print in milliliters (ml) from your slicer software.
Multiply this volume by 19.32.
The result is the estimated weight of gold needed in grams.
Formula: Gold weight (g) = Print volume (ml) × 19.32
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Method 2: Using printed item weight
Weigh your printed item in grams.
Divide this weight by 1.1 to get the volume in milliliters.
Multiply this volume by 19.32.
The result is the estimated weight of gold needed in grams.
Formula: Gold weight (g) = (Printed item weight (g) ÷ 1.1) × 19.32
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Method 3: Using a simple ratio
Weigh your printed item in grams.
Multiply this weight by 17.56.
The result is the estimated weight of gold needed in grams.
Formula: Gold weight (g) = Printed item weight (g) × 17.56
Note: 17.56 is the ratio of gold density to cast resin density (19.32 ÷ 1.1 = 17.56)
All methods should give you the same result. Choose the one that's easiest for you based on your available information.
8. Mechanical Properties
MSDS https://drive.google.com/file/d/1L_SanXBseVcXb8rWoZISSRgoiCXcRK3i/view?usp=sharing
TDS https://drive.google.com/file/d/1WeMzB3VqyfW5yzjWkbSNQDnE6J_KbQLP/view?usp=drive_link
Cast Purple Mechanical Properties
Shore D 70
Tensile Strength 20Mpa
Young’s Modulus 600Mpa
Elongation At Break: 5%
Viscosity: 300cps
Heat Deflection Temperature: 50C
Shrinkage 6% per volume
Cast True Blue Mechanical Properties
Shore D 65
Tensile Strength 20Mpa
Young’s Modulus 600Mpa
Elongation At Break: 4%
Viscosity: 300cps
Heat Deflection Temperature: 50C
Shrinkage 6% per volume