I have a UPS provided Zebra Printer ZP-450 and they supply the 4x6 labels. When I try to print labels using this printer through shopify the label is light and hard to read. When I print from my UPS account the label is crystal clear. It is not the DPI settings for my printer or one would not be clear and the other "fuzzy". I have called UPS they say since it is "fine" through their website it is a Shopify issue. I am not sure if this is by design so you can not use the free printer and labels provided by UPS - I hope that is not the case. Any help is appreciated. Thank you.