Where's the Z scale one? Just kiddin' Well I am thinking about making one, a B&O dwarf .. oh brudduh' (as Bugs Bunny would say)...
@Jesse6669 here you go.
I had used the free version of Fusion to design them and then had used it to scale the HO size signals to the next two smaller sizes. I had made the center hole for the LED a little different for the N scale ones. I scaled the N designs down to Z scale and worked on the hole up the center a little more. It will still hold a 0402 SMD LED and probably another above the lower one in the two aspect signals. I'm about positive if that didn't work you could get two 0201 SMD LED's in the Z ones also.

The four designs shown above can be printed in the four different scales/sizes.

I'd recommend leaving the supports on until they are painted and ready to use.

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These are really small. If you haven't guessed it that is my finger behind the signal.

I didn't paint the one above black to block the light since the paint hides some of the detail. Paint them black, best to use an air brush probably for thinner coats. Turn the intensity of the LED down with a different resistor.

I'm still amazed at what the AnyCubic printer I bought a couple years ago will print. Newer models have replaced it but doubt they print much better. These are super small so print extra as you will loose some, I did.
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You can find the print files for the Z Scale size signals on my thingiverse.com account
( HERE ).
You can find the print files for the N Scale size signals on my thingiverse.com account
( HERE ).
You can find the print files for the HO Scale size signals on my thingiverse.com account
( HERE ).
You can find the print files for some that are halfway between N and Ho Scale size signals on my thingiverse.com account
( HERE ).
More info on my site also
( HERE ).
Sumner