A Unicorn Head Nightlight. The head and horn are printed separately. They are designed to be used with small LED lights. There is a bar in the middle of the head that you can use to hook the light on so that it stays in place. There is a similar bar at the bottom of the horn, near the opening. It can be tricky pushing the light past the bar in the horn and I do not recommend printing it at a smaller scale. There is an anchor at the bottom of the head so that you can tie up the wire from the horn to keep the horn tightly in place.
I have printed it with natural PLA and glow in the dark green and blue PLA and they all work fine. Any translucent PLA should be suitable.
For the lights I used one blue and one white LED in the head and one red LED in the horn. They were purchased here: https://smile.amazon.com/gp/product/B00H98OS2W/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&th=1
This is what I used as a power adapter: https://smile.amazon.com/gp/product/B073QTNF9F/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1
I used a three terminal switch, bought here, to switch between the LEDs in the horn and head. A diagram for how to wire a three terminal switch is in the pictures above. https://smile.amazon.com/Gardner-Bender-GSW-62-Electrical-Terminal/dp/B000HEKSB0/ref=pd_bxgy_60_img_3/137-7911674-4029762?_encoding=UTF8&pd_rd_i=B000HEKSB0&pd_rd_r=411ad33d-64c6-11e9-8c99-472c1499fd9d&pd_rd_w=EP4Bs&pd_rd_wg=liuMN&pf_rd_p=a2006322-0bc0-4db9-a08e-d168c18ce6f0&pf_rd_r=1RT4F805VHAD5EA2SV63&refRID=1RT4F805VHAD5EA2SV63&th=1