The short answer is YES.
The longer answer is that the quality of the end product is our top priority. As you know, 3D model plays a paramount role in ensuring the quality of the end product so it has to be optimized for 3D printing.
If you're unsure about your designs, that is not a problem, we will review them for you.
If you've printed your designs a number of times and know exactly what settings should be used to guarantee the best quality print, add the settings during product upload process.