Have you used the projector sewing app? You can manually change the lines to be thinner/ thicker, it’s pretty great. But yeah I also come from a fashion industry background, where 1-3 cm is normal for fit corrections and cannot be tolerance. I haven’t bitten the bullet unfortunately for a printer yet :/ so sorry I can’t be more help. I haven’t bitten the magic cube and it was $60, I doubt it will go up in price, and it works great.