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Bjorn For cutting rubber we used an Olfa brand razor knife (type with snap-off blades). Rubber dulls edges fast so it's necessary to change blades often. Dull blade = high force to cut = rubber deforms under cutting pressure = final surface not flat/square. Single edge razor blades work...

Bjorn It's probably rubber rather than plastic. The indentations are likely due to permanent "set". Permanent is the operative word - heat or solvents/chemicals will not restore it to original dimensions. Rubber is hard to machine because cutting tool pressure deforms the rubber during the...