This is not my project but I thought it was pretty damn cool. Has anyone seen an LED sign like this? Or better has anyone made one?
In particular, i am referring to the 3D lettering.
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I think it’s just v-carved
Its just the subtract model setting right ?
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I did not see it in person, only the photo I shared here.
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Reverse carved from the back?
and googling… 
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Is plexi glass the same as acrylic
Plexiglass is actually a brand, like Kleenex.
You must use cast acrylic, regardless of the brand.
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I had to look it up (again), so I post it here:
Cast acrylic versus extruded acrylic