The material is surprisingly bright in the dark, I'd guess it would be blazing under UV. I'm going to try and send a few out tomorrow. As the title states, this is a really simple tray.
Bosnisnbill (youtuber) has a design too.
http://www.thingiverse.com/thing:197975I didn't really like his because it was in my mind unnecessarily thick. I do like that he filleted everything (rounded edges), I hadn't though of that. I always use tweezers to pin, but the fillet makes it easier to scoop with a finger. My pin slots aren't semi circles like his. Semi causes the pins to roll side to side in the bottom. Mine has arched sides to a small flat bottom to keep them there. I may fillet the top of my pinning slots in the future so if you lift the tray one way the pins will all stack in the bottom, but the other way you can slide it out with a finger.
This is a pretty nifty design, by the same guy again.
http://www.thingiverse.com/thing:197990Lots of features. I just don't like the interior of the pinning slots again. Also with both it seems like it would be hard to pick up with the shear walls to a flat bottom, that's why my outside walls have a small curve.
I may eventually redesign mine with all the slots, for wafers and such, top of the slot curved, bottom flat, still arched slot walls to flat bottom. Curved outside walls to pick the tray up easily. I may convert the top right box into a plug holder, although I'm thinking mine would rise above the surface of the rest of the tray, rather than be cut into an overall thicker tray.