In addition to the processor chip (for example, MEGAxxx), you need input / output adapters to the sensors / interface / drives of the printer. And then – you need a PCB, and then – the software of processor chip.
Sorry, the buttons and the display – it’s also a board, but now they are not fashionable to set because of the possibility of control from a PC. Did not take into attention PSU, sensors and other purchased components.
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