Well the BondTech dual drive extruders are great. absolutely everything I expected them to be. But they did not solve the problem. And honestly I didn't think they would. While they do allow for applying a lot more driving force to the filament the diamond hotend still has a problem with whichever filament doesnt get used for a while binds when it starts getting used. I think the problem lies in the sheer amount of exposed surface area of the hotend vs. the size and location of the heater and the thermistor. I could be wrong, but that is what is driving me away from the Diamond hotend. I am all set to start getting this Geeetech 3-in-1 mixing extruder up and going with the bond tech and the blue ptfe tubes and just have a really awesome machine but don't you know that hotend is taking it's sweet time getting here. So I went and checked on the status of my order and I just wish I could have ordered this too from them Sweden. 2 month shipping time..