here are the models:
register: models/props/money_printer_pieces/register.mdl
scanner: models/props/money_printer_pieces/scanner.mdl
display: models/props/money_printer_pieces/display.mdl
paper drum: models/props/money_printer_pieces/drum.mdl
printer: models/props/money_printer/moneyprinterv3.mdl
paper: models/props_lab/bindergreen.mdl
increment and storage upgrade: models/props_lab/reciever01d.mdl
there is no model for the money upgrades, this is due to it being a cylinder with a texture on it