Quoted from Dr_Gonzo:I pulled the mylar on my Pinbot using heat. Very little paint loss, a couple of tiny flecks was all that was lost. I've got some pics on another computer,I will find them.
I used a can of compressed air (dust off for electronics, cameras etc) and held it upside down while spraying. This way the pressurizing thing in the can comes out and acts like freeze spray. Kind of a hack but worked well on my bride of pinbot. Don't know if the technique will work on all machines but my result was very good. Only very few minor paint losses. There is a video on YouTube where someone shows how to do it on a TZ. If you gonna try it, be super careful and try somewhere where it does not show as much. Also don't stress it, let the freezing complete before trying to rip the Mylar off. I used a credit card to get one end up a little and then I could grip it with my fingers and continue. Up to you to try it but it worked for me!