Mk2 New and Improved Design! Ever had to repeatedly un-jam flexi-filament from your MakerBot or FlashForge 3Dprinter? Now you wont have to with the easy but effective upgrade. All you have to do is replace one component with this new upgrade Mk2 and motor jamming will be a thing of the past. The Mk2 has been designed to restrict filament movement preventing bending and thus reduce the change of jamming. Jamming my still occur occasional but the motor will not, helping to protect your motor from damage. Un-jamming is consequently much easier and can even be achieved by using the 'change filament' - 'unload' program on your 3D printer. Unscrewing fiddly nuts and bots is now a thing of the past. Print time @ 0.15mm is 12mins. Supports needed. Please print as shown in pictures.Any comments are welcome. Thanks :), ReneeCel