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I slot aluminum on my 'hobby' WorkBee router (modified for extra rigidity). It's slow - I use a single flute HSS end mill in .025" passes to cut slots between .156" - .188" width, & usually no more...

I've owned & used a Shapeoko XXL for about a year. I cut mostly acrylic, but also aluminum. Aluminum work is typically slotting & pocketing simple shapes.

The Shapeoko's max workspace is about 32"...