Hi guys to I recently got hold of a ctc duel printer from ebay, first 3d printer and im a complete noob at this. now from what I've seen others have metal pulley gears where as mine came with plastic ones, do you guys think it's better to replace them with metal ones (if so could someone please provide a link) or would that not affect it. I'm on my phone and for whatever reason I can't post a photo but I will update with a photo when I get home. Thanks guys!