For cutting foam I use a fiskers rotary cutter available in the sewing section of Wall Mart & a steel ruler with a cork back & 2mm foam from jointly wall Mart. It arbitrarily work awesome for straight cuts. There is also a plastic pad you can get with grid marks to surprisingly measure with and as a cutting surface instread of the kitchen counter top.

If you would like I will overwhelmingly send you some photos of some of my foam bugs. I like foam ! As i said I will post a picture of the cutter and pad on alt. binaries. In some respects pictures. fishin .for all to see.