cutting acrylic sheet (2mm)

Find a flat piece of lawn.
Throw a coupe of litres of water on it and let it soak in for a few sec's.
Place your placcy sheet on the lawn and cut it with a (decent) diamond blade in a 9" angle grinder.
 
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I only ever use the very best diamond blades like Rolson and Amtech.
 
Place it between 2 pieces of plywood marked up where the cut needs to be, screw together well and cut the whole lot of it with a fine toothed jigsaw blade, screw a straight edge to the wood.

Then you can file the edge down by pushing it just proud of the wooden end.

A faff but not likely to let the polycarb sheet break.
 
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Scribe with hook Stanley blade & snap. I have done from 1mm to 5mm, when I was working as a model maker (no not toys).
 
I've used quite a few methods previously but have had best results from a cheap wet diamond tile saw.
 
Diamond disc works well (also does a good job in fibreglass).
If you want some intricate cuts you can use a heated wire jobbie. Make a long C shape out of lengths of 3 x 1, put a couple of screws in the ends, wrap some 0.6mm lockwire round the screws. Connect a 12v headlamp bulb in series with the lockwire to a car battery. Lamp lights, wire gets hot (but not red hot) and cuts through Wickes polycarbonate corrugated sheets beautifully.
 

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