I printed off and made a Unicorn LED Night Light for my Daughters 5th Birthday. My Son also wanted a Night Light but he wanted something else. Since he loves Fire Trucks and Firefighters and I couldn't find anything like it, I designed this in OnShape.

I just used black PLA for the body, back and wheels and white PLA for the diffuser plate and printed everything with 100% infill. I found using a textured PEI coated build plate gives a nicer finish to the diffuser plate when its not light up as its better at hiding and slight imperfections.

Assembly

1. Glue the plate into the body, I used just a few small dabs of CA glue along the outside edge of the plate and make make sure its sitting flat on the body.
2. Install the LEDs into the back plate, I put the strip right against the back wall. It uses about 1 Meter of LED strip. I used these from Amazon and comes with a remote to change colour, brightness etc. and USB plug for simplicity. The adhesive strip should be enough to hold the strip in place, i added a few dabs of CA glue just in case. You'll also need to file or cut a hole for the USB cable to come out the back. I just filed a channel for the USB cable near the wheel.
3. I added 4 old 608 bearings I had laying around in the bottom wheels of the back for extra stability although this is totally optionally and should be fine without.
4. Slide the back into the front and add a bit more CA glue around the seam to make it permanent
5. Mount the LED Strip IR receiver, if you strip has one, along the a side so it can detect the remote from the front. Or you can just mount it on the back.
6. Glue the center wheel hubs into the middle with CA