I used a thin kerf non ferrous blade in a dewalt chop saw, with careful setup and alignment for 90° cuts, and used layout dye and a scribe to mark the cuts. Worked great. The blade was around $40 on amazon. Slices through aluminum easier than most hardwoods. I used silicone spray as a lubricant too.
Makes a nice rooster tail of aluminum shavings, keep that in mind when setting up a space to cut, it will be messy!
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