Hi Guys i have just started machining foam board for the first time
im machining with a:

4mm cutter
24000rpm
4000mm/pm

75% of the letters i am cutting come out perfectly just slip straight out
but there are a few that will not release from the material i think the swarf is slightly melting the letters to the sheet.

i thought it was the cutter getting too hot so i checked this. But the letters that are sticking are in completely random

does anyone know why most of the shape come out perfectly but a few will not release.?