Anybody ever tried to retrofit a heatbed to the Davinci mini one with the proper dimensions (165 mm x 165 mm or 6.5" x 6.5").
Where can I find a heatbed that fits and a corresponding power supply / PID controller?
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Instead of replacing the bed, you could invest in a silicone heating element and top it off with a piece of (Borosilicate) glass.
If the printer board has exposed headers to attach a heated bed, which is possible, but not certain, you could use an SSR (solid state relay) to power the bed using the signal from the board to set the temperature. Alternatively use a thermostat for an incubator to create the signal for the SSR. Note that all these parts can be sourced from those typical online websites.
In case the wires of the silicone heater stick out, use a layer of cork where you cut out space for the cables and thermistor.