Kudo3D Bean User Manual page 14

5. Why is the resin container lifted during printing?
The vacuum force and the adhesion between the cured layer and the Teflon film cause the lifting. The
height that the container is lifted indicate the amount of separation force. The lifting of the container
actually reduces the separation force but too much lifting indicates there is a problem.
If you experience a sudden increase in the separation force, the printed layer must have wrapped into a
suction cup due to the shrinkage. You would need to increase the exposure time a lot more to reduce the
warpage and at the same time increase the lifting height. A lot of times, the vacuum force is catastrophic,
especially when the pattern is a circle. The only thing you can do is to rotate the model to mitigate this
effect. Using a harder resin will also help.
6. What is the life time of the Teflon film?
The life time depends on the separation force. If you experience vacuum forces during printing, you may
need to replace the film right away. If you keep printing at the same spot, the life time will be shorter. If you
print larger models, the life time is also shorter.
WARNING: Vacuum force can be caused by hollowed model without venting, bowl shape models
without venting or suction cup formed by shrinkage. Vacuum forces are often catastrophic!
7. Why the Machine State is not operational?
When the raspberry pi fails to communicate with the mega2560, the machine state will show connecting.
This could happen due to the following reasons
7.1 The firmware of mega2560 is corrupted.
7.2 The USB cable or connectors between the mega2560 and Raspberry Pi has a problem.
7.3 The mega2560 is dead. You can plug in the mega2560 directly to a PC. Under the device manager,
you should find a COM port assigned to the mega2560. The driver for mega2560 is CH340. If you
can't find it, please press the reset button. If still no COM port is assigned, the board is dead.
8. How to optimize the exposure time for a resin?
Please download and print our calibration sample. Browse the article in our
blog https://www.kudo3d.com/understanding-kudo3d-high-resolution-calibration-model/
You may need to print a few of them to find the best exposure time. Please note that the LED lamp will age
and the power will drop. You may want to calibrate the exposure time again every 500 hours.
9. What to do when the surface quality of the printouts degrades?
9.1 Please check if the carrier of the linear guide is loose.
9.2 Please check if there are residual lubricant entering between the anti-wobbling piece and the platform
holding arm.
WARNING: Dry lubricant is the only option for Bean. If you use other type of lubricants, the
surface quality will be poor.
We recommend using Kudo3D dry lubricant.
Kudo3D Bean User Manual
Ver. 1.0
14 of 14