Simple AMS Shelf Option I enjoy printing a printer mod just as much as the rest of us do but sometimes keeping it simple works too. I have seen people set up CFS/AMS units on the Hyper Tough shelfing units from Walmart. Which is a awesome set up/solution since they are less than $20 and do not take 20+ hours to print. The main complaint was that the unit didn't open all the way or slide out, which made it challenging to put in rolls of filament.