A. It’s original document problem, like Amazon, Ebay, Fedex, USPS, Shopify, Etsy, so on main e-commerce and courier company support 4″ by 6″ label, the original PDF document is the proper size which is printed clearly in perfect matching with the label; If the original doc size is not right, whatever you do, cant get as clear as proper original size doc printed well. Nonetheless, there is still a way to print have to bear lower quality than the average. Here is a step (Based on the driver and printer have been set up correctly and could print original PDF 4*6 inch well) :-
OPEN WRONG SIZE PDF DOCUMENT
-> CLICK PRINT
-> SETTING PAGE PUMP OUT, TRY TO SET CUSTOM SCALE (DEFAULT PARAMETER IS 100) RANGE FROM 50-100, ADVICE FIRST TRY 78
-> THEN CLICK PRINT.