(03-12-2021, 04:10 AM)TrainMan2001 Wrote: I am currently cutting out pieces of the roof from 1.5mm thick plasticard (it's actually really hard to cut!).Rather than trying to cut through thick plasticard with a craft knife, you might want to get a scriber (also known by modellers as a 'scrawker' or 'skrawker'). This has a hook shaped blade that actually removes a very thin sliver of plastic as you draw it towards you (rather than just trying to displace the plastic each side of a knife blade, which is what makes it so hard to cut thick material).
Also great for scribing (obviously!) panel lines, woodgrain, etc. Mine is a REALLY USEFUL tool.