Pdf to 80 mm for thermal printer

Hello i have a codegeniter website i need to remove some text boxes from it and make that the pdf is generated 80 mm as i need to print from a thermal epson 80 mm printer Either we modify the text box if possible or we add a new system to create an entry ticket Here is the scenario A client enter the shop and on our tablet we can create a client entry if a new client or search from our db ( when we type the client name if exist we select or we can just click on the name and it gives us a fill up form to add a new client ) , then the second page we have a page where we can add material being given by client . ( name and model of product , serial number , repairs to be done , price , advance payment , commentary box ) And once we click on save button it send an sms to the client number and generate a pdf ( 80mm ) to print on thermal printer . Only codegeniter When bidding write Expert only in bid otherwise all other bid will be disapprove.