Best method to cut this?

[FrankBuss]

PS: important for cutting plastic, is the right setting for plunge rate, RPM etc.:

Problem with cutting plastic

You need to move the machine fast enough to maintain an adequate chipload, and spin the endmill slowly enough that even when it slows down into a corner it won’t overheat and begin to melt the plastic. See https://precisebits.com/tutorials/calibrating_feeds_n_speeds.htm for a testing technique You’ll also want to clear out as much as you can using conventional endmills — just use the ball where needed for undercuts.

The default setting in Carbide Create for ABS Plastic clogged up my drill bit quickly, RPM was far too slow.