This is a concept of a spool holder for the Prusa I3. With the Carousel design along with how it will be situated the filament will be directly over head of the hotend for easy un-spooling.The bottom plate was to be adapted to a flat bottom with fastening capability to a flat surface. The system is stackable as well. All spools on the carousel are accessible and easily changed out. There is a slot in the spool plate to put a small piece of sponge to wipe the filament as it is fed into the hot end. It is capable of using a 5/16" threaded rod down the center and Z660 bearings for add stability or just the pivot pins could be used. i decided only four days ago to enter this challenge and As this is only my second design from chicken scratch on a piece of paper to a 3d object. i have no formal 3d design training and have only recently started to dabble in design aspect of 3d printing. So found it to be a little bit of a learning curve. The main issue was that i was going to have a printed product for the entry deadline. test prints came up to large for some reason. i thought it was my design capability and my work that was at fault. i did a work around to no avail. But here is the real problem....... and it may also help a fellow novice designer. https://forums.adobe.com/thread/1397645 i will see this project though to final product... As i do like the design :) Bottom line, thank you for your consideration and here's hoping for a win ....as i'm also vary low on filament.Instruction to be completed as i get the scale issues sorted out. First configuration is with the prusa mount. Second base is comprised: spool carousel arm and carousel plate just revised. The new stl and is labeled with "example" in the name,is just for showing the configuration of the second base configuration. third way to set this up as well, just fasten the carousel plate to your table with screw and washer thought the angled slots. Happy printing, and more to come for updates.