7-Segment frame and transparant segments. Size 27 x 47 mm. WS2812B LED display behind the segments needs only one control wire for 28 segments.
Arduino : Segment arranged a-g clockwise. Adafruit library.
byte tab[]={0x3f,0x06,0b1011011,0b1001111,0b1100110,0b1101101,0b1111101,0x07,0x7f,0b1101111}; //shapes

void num( byte n, byte p, unsigned long c) { // digit n, position p, color c
byte m=1; n= tab[n];
for(byte i=0; i<7; i++)
{
//c=random(0xffff);

//if (n&m) strip.SetPixelColor(i+p multiply 7,c); else strip.setPixelColor(i+p multiply 7, 0);

if (n&m) strip.SetPixelColor(i+p 7,c); else strip.setPixelColor(i+p 7, 0);

}

//For some reason, asterisks are not always shown in this editor. If you see p 7, it should be
p-asterisk-7 ( p*7, multiplication). When you copy-paste, please check and correct this.
//For random segment colors, uncomment random instruction.

This thing was made with Tinkercad. Edit it online https://www.tinkercad.com/things/f5bTvmHpG3q

Prusa

I3 MK3S

No

Yes

0.2

20%