Occasionally, the voxelizer may produce extra rows of extremely low-density voxels. Depending on the Voxel Sample Rate chosen, the density can range from 0.04 down to 0.001. They can occur on both parts and supports. These extra voxels are due to the numerical error inherent in fixed-precision floating-point numbers. It is difficult to predict if, or where, these extra voxels might occur, but they are more easily seen on large, flat faces that are neither parallel nor perpendicular to the baseplate. If these extra voxels occur and pose a potential problem to the simulation, try re-running voxelization with a higher Voxel Sample Rate or a different Voxel Size.