Just stumbled across your plugin, WooCommerce Print Invoices & Delivery Notes.
I am still very much in development mode with this particular site and trying to get everything to function properly before I go live with it (I am using Desktop Server to build the site)
I have just done a fake transaction to see how everything works and discovered that when I Print preview either the Del Docket or Invoice, it shows an incorrect amount for the item, but the total is correct.
I am using Thai Baht as my currency and the item sale price is showing B6 instead of B60, it also displays it this way on the single order page under Line Subtotal and Line Total
I have set Woocommerce to remove trailing zero's and have the Number of decimals also set at zero.
I am assuming it is a formatting issue, but I can't find anywhere to change the setting, I am not strong on the css side of things if that is what is required to fix this issue, but if you can supply the code I should be able to figure out where it goes.