Now normally this would really worry me. Not anymore!

Maybe something like this from Lowes:

Diamon Wheel

I personally would put some rubber or something soft in a vice, add my acrylic to the vice, then go at the acrylic at an angle with the dremel diamond wheel, cutting out the slots I wanted.

Maybe also look into this:

Multipurpose cutting bit

Or maybe take a flier on on of these and hope for the best:

Steel Engraving Bit

The important part to remember, assuming I'm reading the design correctly is to ensure you cut at more of a 30 degree angle or so, as opposed to a 90 degree angle.
 
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