I have that cutter and I only get weird cuts when the file is wrong. If you can redraw the heart and see what happens.
If you need more help, you can prob find more info on the USCutter forums.
Sent from my HTC One X using T-Shirt Forums
If you need more help, you can prob find more info on the USCutter forums.
Sent from my HTC One X using T-Shirt Forums