created from Eric Lien (not from me)

new and wonderful design to http://www.bondtech.se

you can use a planetary box http://www.thingiverse.com/thing:1321364

Description

(Eric Lien speak) I have been involved into 3D printing for the last 2 years and one of the biggest problems are related to the material feeding. Todays extruders that uses one driven wheel with a spring loaded bearing that pushes the filament against the drive wheel. This method has some disadvantages as

• Low pushing force
• Risk of grinding the filament that leads to a failed print
• Slipping that leads to underextrusion
• Deforming the filament that leads to increased friction in the bowden tube.

The new Bondtech extruder uses 2 drive wheels that are equipped with sharp teeths that grab the filament on both sides wich gives a lot of advantages over the standard extruders. Some of the most important ones are the following.

• Huge pushing power that elliminates the risk of under extrusion, tests have verified that it is over 9 kg with a 1.75 mm filament.
• Minimal risk for filament grinding
• Possible to go high speed due to the big the pushing power, tests have been made with 250 mm/s printing with 0.4 mm nozzle and with no filament grinds.
• Possible to go with small nozzles
• High torque Nema17 stepper with a high precison planetary gearbox gives high resolution and fast retracts.
• Adjustable secondary drive wheel to optimize grip.
• Easy access to drive wheels for cleaning A walkthrough of the design by Eric Lien: The extruder in action: https://youtu.be/18dc96ZMd2I

https://plus.google.com/109092260040411784841/posts/gnn6rmyWWC6 In a few weeks time I will be able to provide kits with the metal parts and also professional 3D printed SLS parts for the housing components. The current version supports only 1.75 mm filament but a 3.0 mm version are in development. Bill of materials

• 1 x Front housing
• 1 x Rear housing
• 1 x Logo plate
• 1 x Nema 17 with 5:1 planetary gearbox
• 1 x Bondtech large drive wheel
• 1 x Bondtech small drive wheel
• 2 x 5x10x4 ball bearing
• 2 x MC6S M3x16 socket screws
• 2 x MC6S M3x40 socket screws
• 2 x M4 nuts for securing bowden tube
• Bowden tube 4x2.0 mm