Equipping the old-made (however not used) plotter with Bluetooth COM port. Then making the primary PCB and case’s backplate with it. What for? Why not unusual printer? It’s doable to attract PCB on this plotter, face panel of a case, to mount a laser/mechanical cutter and a mechanical engraver. Drawing space of this plotter is 370х270 mm (3700×2700 steps with 0.1 mm decision).
This plotter had produced in DDR and was not working since 1989. In 2019 he was powered on first time and works with none issues.