Below are pictures of an easy-to-build and easy-to-use metal-bladed frame saw for cutting loose items attached to flat surfaces with double sticky-sided foamed tape. Such as Scotch’s.
This saw cuts through the Scotch double sticky-sided tape very well. I tried it on Scotch black 3M VHB Series 4-1000. It is an industrial tape used to attach sheet panels to frames without screws or rivets. It took a lot more force, but I was able to saw through it. A string saw without finger rings would damage your fingers, if it didn’t break first.