Do your print-on-demand stickers have weird artefacts, smudges, spare pixels etc. around them, and you don't know why? Wanna fix it, but don't know how? I've got the simple answer for you, and it'll only take a few minutes to make your stickers look awesome again.
If you want your Redbubble products to look their best - correct size, dimensions, seamless pattern - you've gotta use templates. Below is a list of all the templates I could find (and in some cases, make) for Redbubble products.