Friday, March 12, 2010
Bowden Paste Extruder
As you may recall, the paste extruder I’ve been developing is based on the makerbot design which utilises air pressure to drive the paste from the nozzle. The reason for choosing this route was mainly that it allowed the extruder itself to be very compact, and thus make our lives easier when we get around to the head changer. However, as has been pointed out by various people, this does not offer the same control as say, a stepper motor driven extruder.
Labels: Bowden Paste Extruder
I think you would need to geardown the stepper to get more torque.
I imagine that paste would require some force.
I'll blog it as soon as it's working. It will drive this device, or be an extruder directly mounted on the Mendel X carriage, or drive a Bowden extruder like Erik's development of Ed's idea.
If you want to see what it looks like the files are here:
Bicycle parts are free in low quantities if you have a nice bike repair shop down the road, which is fairly common in the Netherlands where I live.
Forces on the paste are going to be lower than in braking applications, so if gearshifting proves to be functional, great. Otherwise braking cable is still going to be an option.