Heat transfer vinyl settings come from the film maker, not the press maker, and the gap causes most failed shirts. Published temperatures and times, the pre press step people skip, and layering limits.

Design Space lists Cricut fonts and your installed system fonts in one dropdown, and that split explains almost every font question. Writing style, realistic minimum cut sizes, and missing font fixes.

Inkscape is free and covers everything a cutting machine needs. The six Path operations worth learning, how Trace Bitmap behaves, which export format each machine wants, and how to inspect a bought SVG.