Here are 2 types of PolyBrix parts to build all the digits in a 7-segment style.

The parts look like this:

Here's how the digits look:

You need 49 pieces to build all the 10 digits ( 0 to 9 ), out of which 43 are type 1 and 6 are type 2.

If it's not clear from the picture above, the type 2 pieces are used like this:

2 for 0 digit

1 for 1 digits

2 for 4 digit

1 for 7 digit

Printing instructions:

Walls count: 5
Infill pattern: Cubic
Infill density: 15%

No supports.

I've used PETG, but PLA will probably work as well