Cast Resin user guide

 

Shake the bottle and mix the resin in the vat before start printing!

 

This guide is for both Cast Purple and Cast True 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=mdHpgwGPzcE) to help each other print and cast well.

The ideal printing temperture for Cast is beyween 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

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

Exposure:
Recommended
Resin Temperture 25-35C
Room temperature 20-25C
Printer Layer Height Exposure (s) # of Initial Layers Exposure for Init Layers Exposure (s) # of Initial Layers Exposure for Init Layers Note
Photon 50um 18 (s) 5 80s 18 (s) 5 80s
EPA X1 50um 15 (s) 5 65s 15 (s) 5 65s
Photon S 50um 15 (s) 5 65s 15 (s) 5 65s
Mars 50um 15 (s) 5 65s 15 (s) 5 65s
Mars 2 Pro 50um 4s 5 35s 4s 5 35s
Mono 50um 3.2s 5 30s 3.2s 5 30s
Sonic Min 4K 50um 4.6s 5 40s 4.6s 5 40s
Please Keet Lift Speed under 50mm/min for Cast resin no matter what printer you use.

 

Cleaning:
Use a painter brush (or any brush made with hair) remove excess resins on the printed part with Use 95% concentrated Ethanol (preferred) or IPA to clean. Some form of methnol should work but make sure it does not contain acetone.
Do not submerge the parts in alcohol for more than 30 seconds. After 2-3 minutes of cleaning action, remove alcohol with a hair dryer or air blower. For complex part with lots cavities, it may be a good idea to clean/dry multiple times.
Dry as quickly as one can once the print is cleaned with compressed air
Surface should be matte, if you see shiny spots, repeat cleaning on those spots.
AVOID USING WASH AND CURE ALL IN ONE MACHINE

Post Curing:
Make sure print is completely dry before proceeding.
It is important to fully cure Cast to ensure clean burnout.
It is also important to ensure print does not absorb moisure as it may also affect burnout results
We recommend putting print in glycerine to speed up curing without getting water on the print.
Curing time varies with light fixture but most likely to be over 10 minutes and longer.
AVOID USING WASH AND CURE ALL IN ONE MACHINE
Fully Cured Print Should feel hard and a bit brittle

Investment and burn out recommendation
Our users have reported successes with Plasticast® investment by Ransom & Randolph
https://www.ransom-randolph.com/plasticast
Recommendend Burn out schedule can be found here:
https://www.ransom-randolph.com/_files/ugd/cc5f22_902ad781b4e74bf3b3d55bff34f7fe6c.pdf

Some user may have hard time finding Plasticast, here is an alternative found in UK and recommended by VOG
https://www.srs-ltd.co.uk/products/investment-powder/classic

MSDS for Cast Resin
https://drive.google.com/file/d/1L_SanXBseVcXb8rWoZISSRgoiCXcRK3i/view?usp=sharing

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