Cannot Find Correct BlueCast X5 Settings for Mars 2? How to Adjust for New Firmware
The Elegoo Mars 2 (and Pro version) remains a workhorse for the jewelry industry due to its 2K Mono screen. However, many jewelers have reported that after installing the latest firmware updates, their previously perfect BlueCast X5 settings no longer work. This often results in non-adhesion to the build plate or "pancaking" in the vat. Because BlueCast X5 is a high-wax content resin, it is extremely sensitive to the transition layer and light intensity changes introduced in newer firmware versions.
1. Why Firmware Updates Affect BlueCast X5
Recent Elegoo firmware updates changed the way the printer handles PWM (Pulse Width Modulation) and Light Uniformity.
- Transition Layers: Newer firmware often introduces a "smooth" transition between bottom layers and normal layers. For BlueCast X5, which requires a high "squish" for adhesion, this transition can sometimes cause the print to delaminate early.
- Light Intensity: Some updates recalibrate the UV output to extend screen life, meaning your old exposure times may now be "under-exposed."
2. The "New Baseline" Settings for Mars 2 (Latest Firmware)
If you are running the current firmware, forget the old spreadsheet values. Start with these calibrated baseline settings in Chitubox or Lychee Slicer:
| Setting | Value | Notes |
|---|---|---|
| Layer Height | 0.03mm - 0.05mm | 0.03mm is preferred for high-detail jewelry. |
| Bottom Exposure Time | 45s - 60s | BlueCast X5 needs a strong bond; do not go lower than 45s. |
| Normal Exposure Time | 2.8s - 3.2s | Start at 3.0s for the latest Mono screen firmware. |
| Bottom Layers | 6 - 10 | High wax resins benefit from more bottom layers. |
| Lift Speed | 40 - 50 mm/min | Slow is key. Fast lifts will tear the wax resin. |
3. Temperature: The Hidden Variable
BlueCast X5 is a professional casting resin with a high percentage of wax. Unlike standard resins, its viscosity changes drastically with temperature.
- The Requirement: Your resin and printer environment must be at least 25°C - 30°C (77°F - 86°F).
- The Problem: If your room is cold, the firmware's "Wait Time Before Print" or "Light-off Delay" won't be enough to let the thick resin settle, leading to "blobs" or failed supports.
4. Adjusting Rest Times (Light-Off Delay)
With the new firmware, "Rest Time After Retract" is a crucial setting for BlueCast X5. Because the resin is thick, the build plate "traps" resin as it descends.
- Set Rest Time After Retract to 1.0s or 1.5s.
- This allows the wax-heavy resin to stop moving before the UV light hits it.
- Without this delay, the new firmware's faster movement profiles will cause "layer shifting" in the delicate jewelry supports.
5. Troubleshooting Adhesion Issues
If your prints are still failing on the latest Mars 2 update:
- Sand the Build Plate: Use 400-grit sandpaper to give the aluminum plate some "tooth" for the wax to grab onto.
- Primer: Some users apply a very thin layer of standard "Rapid" resin to the build plate and cure it for 10 seconds before starting the BlueCast print to act as a chemical bridge.
- Check the "Tank Clean" function: Use the firmware's Tank Clean function for 15 seconds to ensure there are no microscopic cured bits in the FEP that could disrupt the first layer.
Conclusion
Finding the correct BlueCast X5 settings for the Mars 2 after a firmware update requires increasing your exposure slightly and significantly slowing down your lift speeds. Newer firmware prioritizes speed, but casting resins require patience and stability. By using a 3.0s normal exposure and a 1.5s rest time, you can overcome the firmware's aggressive motion profiles and return to printing high-quality, castable jewelry models.
