Regarding thick cardboard but it goes a little strength so obviously it is specified up to 6mm cutting but not go try it on a rigid PVC plate thickness. Or even for thick plastic packaging that cut very well, and for a carpet so the paper is a breeze.
I have not seen spare saw although easily removable by a screw and indicated on the instructions but I look elsewhere on Amazon's got to be if not for the price I'm happy. We can still improve it by refining the metallic rear so it does not block and may be for a set of wheels more or less teeth slightly increase his speed but the product is already very good.