I know this post is from Dec., but I'm having an identical problem with honeycomb infill set to .20. While slicing, it gets stuck on either "preparing infill" or gives me the slice failed 255 code. I even cut my object in half into two separate files to see if it mattered how large the file was. Can someone please advise how this was fixed? I double-checked and my infill is not set to 100%.