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NEMA23 Direct Drive Extruder
So while the smaller motors have enough power they seemed to get really hot, I designed this and have had good results. Designed for 1.75mm filament.3D printer parts and enhancements
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Update v2: https://www.youmagine.com/designs/nema23-direct-drive-extruder-v2
This is directly inspired by the popular extruder by whosawhatis http://www.thingiverse.com/thing:15718. So popular in fact that MB is trying to patent it: http://www.freepatentsonline.com/y2014/0120196.html
His design is great but I wanted to use some of the bigger motors I had around so as to reduce their heat. This one also uses the common 608 skate bearing and hobbed pulley (I made my own but 12mm OD ones should work). 1/4x1" springs should have been enough but I found I wanted more pinch force so went with even longer ones. I recommend printing at least the 'Motor Attachement' in PLA since it seems to hold a thread much better than ABS.
In case you haven't heard elsewhere it is very important to turn down your motor current until is is close to slipping during extrusion. With too much power it is very easy to strip the filament... especially so with this beefy motor.
Materials and methods
- PLA Filament
- NEMA23 Motor (preferably with axle out both sides)
- M5 x 30mm
- M5 Nuts
- 4mm OD quick release tubing connector
- 608 Skate bearing
- Hobbed pulley (0.5"/12mm OD) (http://www.reprapdiscount.com/mechanics/52-hobbed-pulley.html)
- 1/4 OD x 1.25" spring (http://www.mcmaster.com/#9657k106/=sju6jh)
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