Bevelling EVA foam edges

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How to cut EVA foam edges at an angle so armour panels meet cleanly at corners and seams, for beginners making their first foam armour.

When two flat sheets of foam meet at a corner, the raw squared-off edges either gap open or create an awkward ridge on the outside of the piece. Bevelling solves this by cutting one or both edges at an inward angle so the faces meet cleanly, much like the mitred corners of a picture frame. The result looks far more intentional and saves you from hiding a messy seam under filler or paint. The most common approach is to hold your utility knife at an angle — often somewhere around 45 degrees, though the exact angle depends on how sharp your finished corner needs to be — and draw it steadily along the foam edge in one smooth pass. Some makers prefer to mark a guide line on the back of the foam first with a ballpoint pen or a fine marker so the cut stays consistent. For tighter curves or smaller pieces you may need several lighter passes rather than one deep cut, letting the blade follow the shape without tearing. A sharp blade makes the biggest difference here. A dull edge drags and compresses the foam before it cuts, leaving a ragged finish that is difficult to smooth out later. Change or snap off your blade frequently, and keep a sharpening stone nearby if you are using a fixed blade. Test cuts on scrap pieces of the same foam thickness before committing to your finished panel. Safety matters whenever you are working with cutting tools. Always cut away from your fingers and your body, and use a cutting mat or a scrap board underneath your work so the blade does not skate off a hard surface unexpectedly. Keep blades retracted or capped when not in active use, and dispose of snapped segments in a puncture-resistant container rather than loose in a bin. Younger makers should have an experienced adult present when handling utility knives.