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Hello Adrian, I still have that PLA pulley until today, I'm really impressive how strong it is of course you need print with 85 to 100% infill, no heating problems but I don't recommend you leave that stand direct in the sun for a while. About the Wheel pulley I use one I found for other Autor, he has a lot of wheel pulleys for different kind of wheels https://www.thingiverse.com/JuniorPotato93/designs , give me more details about the 5mm shaft then I can help you.