SVG Files: I try to make my files as simple to use as possible. After all, I want to make your life easier! I group colors together on my SVGs so when you import them into your Silhouette Studio program all you have to do is ungroup the main group, trace, and cut the groups that remain.
Printables: As for my printables that I create, the easiest thing for me is to print them on 4"x6" photo paper. I do not own an ink jet printer, just a laser printer which does not make for good crafting, so, I like to send my designs to a photo printer. I mostly use Walmart, 7 cents for prints sent right to my door? Can't beat that! Once I recieve them, I simply cut them up with my paper cutter. Also, some photo printers only print 4"x6" so if you own one of those printers, then they will work perfect for you also!
