Guide
Spacing and bleed
Spacing is the gap between designs on the sheet. Bleed is extra artwork around the edge of a design. You set spacing in the builder; bleed goes in your design file.
Spacing
Spacing is the gap we leave between designs, and between each design and the edge of the film. A wider gap makes cutting easier but uses more film. A narrower gap saves film but leaves less room for the blade.
A sticker sheet with cut lines needs more room, so we set a minimum spacing for it. Spacing on a sticker sheet
Some printers recommend a spacing on their own page. When they do, you'll find it on their profile here.
Bleed
Bleed is artwork that runs a little past the line you cut along, so a slightly off cut doesn't leave a thin white edge.
We don't add bleed: designs are packed exactly as you supply them. If a design needs bleed, add it in your design software before you export the PNG.
Using both
Set the spacing wide enough to cut between designs safely, and add bleed to any design that needs it.