How to direct the diffusion of a led?

[Zoulou (zou)]

Hi guys,

Using capacitive sensors i would like to make a touch power button on a case (plastic PLA) without hole like this:

But I’m wondering how to make the diffusion of the light of the led underneath follow the power draw path?
Should i make that part thinner?

Thanks

[Zoulou (zou)]

I think i should print mixed dark PLA and translucent material.

[Kyrian (Jean-François LARBRE)]

Hello Zoulou,
You can also print the front of the button leaving the button symbol empty and then fill it with translucent resin.

[mcdanlj (Michael K Johnson)]

Could use two-part epoxy mixed with corn starch or something similar to make it translucent as the filler resin.

[Zoulou (zou)]

Interesting approach! I was thinking of more professional stuff but this can do the trick too.

[mcdanlj (Michael K Johnson)]

I think the hard part is getting the capacitive sensor pad close enough to the surface to register. Are you thinking of embedding it in your print?

[Zoulou (zou)]

I did not worked yet on the sensor, i wanted to imagine everything before testing.
Look doable: TTP223 Capacitive Touch Switches - YouTube
Yes embedded it in the printer.