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De-lamination / separated layers (SL1/SL1S)

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Last updated 3 years ago
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If you encounter de-lamination, separated layers, or missing layers, the cause is usually in a broken SL1/STL file. Another cause can be a faulty UV LED panel or dirt in the resin tank. 

Note that this is a different case than a lack of supports, where entire parts of the print can be missing.

If you start a print that consumes more resin than the tank's capacity, you should refill resin right away when being prompted (max 3-5 minutes). This is to avoid artifacts and potential de-lamination. If possible use the hollowing feature in your slicer.


  • Try printing a pre-sliced sample object from the Prusa driver's package and see if the issue persists. If it does, clean the resin tank properly and try again.
  • Continuous issues with separated/missing layers can be caused by a faulty UV LED panel – check whether it works correctly by removing the tank and initiating the Display test. Navigate the menu to Settings -> Advanced settings -> UV & Display settings -> Display Test. Follow the on-screen instructions and inspect the logo through the orange cover through your smartphone or camera.
WARNING: DO NOT LOOK DIRECTLY INTO THE UV LED, while it is TURNED ON! Even though the orange cover provides some protection if you want to check the LED panel look at it through your phone camera app or take a photo so you won't look directly into the light.
  • If the tank and UV LED-panel checks out, the cause is most likely a broken object file (3d model). Either try re-slicing the model or download a new one.
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