I found ultrasonic cutters absolutely perfect to cut PE up to .2mm.
Perfect cut, no bending or deformation of parts, no burrs, no parts jumping to the carpet monster.

Absolutely GREAT for 1:700 Chinese kits ultrafine railings.

Need cutting pad below, harder than ordinary (green) mat pads. Example:
https://www.greenstuffworld.com/en/cutting-mats/3190-hobby-cutting-block.html

Ultrasonic cutter price has seriously dropped since last Winter. Some are available on Amazon for less than $100.