These are the STLs you will need to install our 30mm fans to our hot ends. Please download the correct STL for which printer you own (Play, Simple, Plus). These will fit our Ubis 13S Hot End. There are two versions of this fan shroud, with or without LED mounting capabilities. Do you want to illuminate your 3D printing? Then purchase our LED board and download/print the LED version. If you need to purchase the 30mm blower fan you can find it on our site - https://printrbot.com/shop/fan/. If you need to purchase the Ubis 13S Hot End you can find it on our site - https://printrbot.com/shop/ubis-13-s-hot-end/. We designed these files in Fusion360. You can find and alter/improve these files here - http://a360.co/2jRWJlk. Happy Printing from Team PB!