Dr of Sarcastry. Maker, artist, GenX robot. Universal Greeblie. Parody. Repped by RC Josta. NB
Outpost 31 LV-426

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in reply to @tankgrrl's post:

They're laser engraved, then cut out. Acrylic can be used as a light pipe, basically if you butt a light source against an edge, it will diffuse light through the piece (with a diminishing falloff over area, of course). It works even better on a boundary edge, but these need a notch to fit the LED module in.