You are right! I did not notice. I thought I had embedded it.
Not much to look at, I had to run it two or three times to get it deep enough.
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The battery is in contact with the LED when it is slid together. When you snap it into place it is on, when you take it apart it is off. I think it will last 24 hours, not sure. I will let you know after tomorrow.
Radio shack. No seriously, I have had them for a long time. Just like a LED throwie. I used a 10mm white LED and used a blue sharpie to color it.
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I love this. Great idea. The QR code at the top is genius.
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I also had a little trouble the first time I made it, because my middle material was not bigger than my LED, and my top center block slid down just a hair which did not allow the acrylic to snap in.
Wish.com is a good place to by LEDs if you have the patience to wait.
Awesome thank you!!!
I think the embedded gradient I used was lost when I uploaded it. I ran the engrave a few times to make enough clearance. Another option is to use something like a dremel tool and sand down the LED to fit.
I created a new acrylic insert for day 2. Got few people to scan the QR this time. The battery lasted over 2 days. Then I thought it would last longer if it flashed (since it is off for half the time, right?) So the kind people over a NightFire Electronics gave me one from there selection!
I also made an accidental discovery, it makes a great table display. Only three medium draftboards thick. Just omit the holes.
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Ouch, not very kind to people with vestibular disorders in flash mode! 
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Very nice project. Great share. Although, “…as if I have to be asked.” would be the unspoken refrain going through all our heads as we wear this badge.
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This is genius! Thank you for posting this!
Is the battery a 2032? It doesn’t seem to fit in the one I just cut.
Yes, CR2032. It is 20mm. Is yours to large or too small?
how come when I try to save the pic it says PNG and not svg?
The second file is for the “linked” png for the engrave. It gives some extra clearance for a 10mm LED.
Freakin’ awesome!
10mm? Sure it isn’t a 5mm?
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What microcontroller did you use to make the badge flash! Super cool!
Probably just a “Cycling” LED. Still 2 wires but the chip is built into the led. Just hook up power and go.
Something like this?
Yes, you are correct. It is for a 5mm LED.