This is an awesome clock, right down to sound of the servo motors. I didn't make this one with the glow-in-the-dark sheet (well, I did at first, but changed my mind). Instead, this clock uses color-changing PLA. What it lacks in nighttime viewing it makes up for in lack of luminosity.
I printed a 1mm thick plate that fit into the drawing area instead of the luminescent sticker. I used GO 3D Blue UV filament for this which is translucent clear when not exposed to UV, and opaque blue when it is. The translucency was a problem, so the plate actually consists of two filaments. I started printing with Tactink White PLA and paused it when it reached the 0.5mm mark. Then I swapped in the UV filament to complete the print. The resulting white backing to the translucent filament worked very well.
I didn't have an appropriate button handy, so I used a too-small toggle switch instead. I will be replacing that one with one that is a more appropriate size soon.
I also didn't like all the light that leaked through the back of the LED, so I used a 3D printing pen and gobbed over the back of it with black PLA. It isn't pretty, but it is effective!
Monoprice Maker Select V2