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An extruder consists of two ends - a hot end and a cold end. This portion of assembly covers construction of the cold end, or extruder drive, the part of the system that pushes the filament into the hot end. The extruder drive is a pinch-wheel design wherein filament is pinched between a preloaded idler bearing and a toothed drive gear. Filament is pushed hard against the drive gear by the preloaded idler so that the teeth in the drive gear engage the filament, forming something akin a rack-and-pinion drive. The stepper motor then pushes the filament into a Bowden cable, where the filament is constrained and can only exit through the nozzle in the hot end.
An extruder consists of two ends - a hot end and a cold end. This portion of assembly covers construction of the cold end, or extruder drive, the part of the system that pushes the filament into the hot end. The extruder drive is a pinch-wheel design wherein filament is pinched between a preloaded idler bearing and a toothed drive gear. Filament is pushed hard against the drive gear by the preloaded idler so that the teeth in the drive gear engage the filament, forming something akin a rack-and-pinion drive. The stepper motor then pushes the filament into a Bowden cable, where the filament is constrained and can only exit through the nozzle in the hot end.


A modified [http://airtripper.com/1071/airtrippers-bowden-extruder-v3-updated-design/ Airtripper's extruder drive] is used on the MOST Delta, you are encouraged to visit the developers page to learn more about it. Modifications consist of moving the filament path away from the drive gear and adding an infeed tube to facilitate live-changing. Other slight non-performance modifications were also made.
[http://airtripper.com/1071/airtrippers-bowden-extruder-v3-updated-design/ Airtripper's extruder drive] is used on the MOST Delta, you are encouraged to visit the developers page to learn more about it.


== Procedure ==
== Procedure ==
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