Amazon has the stock ones, could save you a few dollars on shipping. http://www.amazon.com/gp/product/B00IEVE4MC/ref=oh_aui_detailpage_o09_s00?ie=UTF8&psc=1 Unless you want to change things up and use a geared extruder motor (which would be difficult on a 1405) this is your best bet. All that said, I am chasing the same issue. I have tried everything you have and don't understand what the problem is.