Fixing Multiple Copper Fills
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Review (ERC/DRC)
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Using Review (ERC/DRC) Tool.
Reading docs about How do I fix the DRC error 'Layers with Multiple Fills' and adjust the Connected Layers rule or copper fills net assignment in Flux PCB layout?.
Reading docs about Steps to resolve DRC 'board layer with multiple copper fills' by setting Connected Layers rules so only one net generates a copper fill on a given layer in Flux..
The most relevant entry I found related to this DRC is from Flux’s “Working with Ground Signals in PCB Design” tutorial (it covers the “board layer with multiple copper fills” / “Layers with Multiple Fills” situation):
Handling DRC Error for Multiple Copper FillsIn setting your connected layer rules as discussed above to generate a unique copper fill for your secondary ground, you may encounter the following DRC error: board layer with multiple copper fills. This happens because there are now two nets (primary ground and secondary ground) that want to create a copper fill on a given layer. Below is an example with a pre-existing primary ground plane and a secondary ground plane both attempting to create a copper fill on the top layer.The solution is to ensure that your connected layers are set to a layer that doesn’t already contain a primary GND plane. In other words, set the secondary ground plane to a different layer than the primary. Note that after making any changes with ground planes given that you have already wired some of your board, you will need to rewire your PCB by adding vias and wires to connect them to the new isolated plane.
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Check overlapping copper
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