I've posted about the issue I had with filament jumping the sides of the spool and threatening to get bound up around the spool support bracket. I said I was going to design & build a filament guide. Here it is:


Obviously, the left one is a top view, showing the guide bolted to the OEM support bracket. The right photo shows the reinforcing strut I built into the underside of the guide's arm so, hopefully, it won't break. So far, so good. And, indeed, the filament has not jumped the spool rim once, or even looked like it wanted to
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I printed the guide out of PETG, on the hope that the higher flexibility of PETG over PLA would avoid breakage.
Obviously, the left one is a top view, showing the guide bolted to the OEM support bracket. The right photo shows the reinforcing strut I built into the underside of the guide's arm so, hopefully, it won't break. So far, so good. And, indeed, the filament has not jumped the spool rim once, or even looked like it wanted to

I printed the guide out of PETG, on the hope that the higher flexibility of PETG over PLA would avoid breakage.
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