1. Print express bill (bill printer). It doesn't matter if your handwriting is beautiful. You can pick it up or not, which is related to the facade, image and professionalism of your store.
Printing the delivery note (color printer) is also related to the image of your store. Receiving a list when shopping will make me feel that the owner of this store is very professional and careful. Sometimes some stores will give me a leaflet of his fine products, and I often consider buying things on it.
If you want to buy it, I suggest you buy it in color, preferably Epson's. There is a kind of ink cartridge with its own ink, which is very good and low in cost.