Originally Posted by
jitkaau
Don't try to cut around paper templates or thin templates with a rotary cutter. If you don't lose a finger, you will shear the edges off your templates so that they are not accurate any more. Best thing to do is to place a rotary cutting rule over the top of your template, along the edge and cut accordingly if you haven't got an acrylic template to cut around. All the best with your projects.
When I'm cutting a polyhedron or rhombus, I want my edges straight - thus my desire to use my rotary cutter. What I've been doing is cutting the shape on the sewing line, and hanging the edge of my ruler over the template by 1/4 inch for seam allowance. Repositioning my ruler causes the template to shift, though. Making tape anchors under it seems to be helping. I use paper if there are few shapes the same so I can save my template material for larger projects.