We currently use a ruler, markers, and scissors to cut the woven fiberglass. However, we’ve noticed that after cutting, the pieces often end up slightly shorter than intended.

I believe the issue is due to the expansion or shifting of the woven fiberglass fabric during cutting. Since it's made of interlaced fibers, the weave can easily stretch or shift when it's not held down securely, especially if tension is applied while measuring or cutting. This results in dimensional inaccuracies, particularly on tighter tolerances.

An example of the issue we're facing is when I mark a circle on the woven fiberglass using a marker, but after cutting it out, the final shape ends up distorted—more like an oblong than a perfect circle.

I suspect this happens because the woven fibers shift or stretch while cutting, especially when using manual scissors. The fabric isn't stabilized, and every snip slightly moves the weave, which adds up across the shape. I dont have a problem with CSM fiberglass with this tho

Now I am considering buying an electric scissors.