This is number three. Very simple. It took 30 minutes to 3D print. 65 mm tall and 7 mm thick. The font is Arial. The bottom thick piece is to make it stay vertical.

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Number zero: https://www.thingiverse.com/thing:4354977
Number one: https://www.thingiverse.com/thing:4338631
Number two: https://www.thingiverse.com/thing:5026440
Number three: https://www.thingiverse.com/thing:5026447
Number four: https://www.thingiverse.com/thing:5026455
Number five: https://www.thingiverse.com/thing:5026480
Number six: https://www.thingiverse.com/thing:5026481
Number seven: https://www.thingiverse.com/thing:5026484
Number eight: https://www.thingiverse.com/thing:5026485
Number nine: https://www.thingiverse.com/thing:5026486
Letter K: https://www.thingiverse.com/thing:5026488