This is an update to the Infill 3D Bowden Extruder, if you are not familiar with the first version it was build to be used in an Infill 3D Delta however the machine is not complete as of today but it will be soon you can check infill3d.com for updates. Most of the changes from the first version are listed in a response to a comment from the version 1 ...
"the walls of the body are not flush with the NEMA17 motor it might be an issue depending in your setup. Also threading the Pneumatic fittings was hard, this is a pesky one since I have different brands 1/8 PT fittings and some fit really well others are loose or to tight, I am trying to find a better balance.
Inserting the nuts that hold the screws with the springs is hard, that area is not too strong push too hard and you crack the body so I am giving it more room to avoid that issue.
No more separate whole extruder with dovetail stl, now there is a body and a separate dovetail you can attach it to the body with M3 screws either vertical or horizontal, if you are not using the dovetail bracket you can use the holes of the dovetail to directly mount the body to your setup.
The idler was not reaching all the way down to the drive gear like I want it, I shaved some material off so the idler has more reach.
I think that it is for now however I might be forgetting other stuff."
Only thing worth noting is the size is smaller now, I removed the tab that was holding the 6mm screw it does not compromise the the strength of the extruder holding against the motor and took off some heft from the extruder.
Instead of using 2 603ZZ bearings it uses only 1 and I had to remove the option to change the dovetail vertical or horizontal, now is just vertical since the body is smaller it only have room to mount the dovetail vertically.
Updates to this item will be available here https://infill3d.com/28-extruders
This extruder is not composed of many printed parts only 2 if you are going to use direct mount or 4 if you are going to use the dove tail bracket.
The extruder is made to be used with a MK8 drive gear, if you put a bigger drive gear might not fit keep that in mind.
I am not adding the mounting screws to the part list since people are going to use different length screws for their machines but note that you are going to use M3 socket screws for mounting the extruder. If you use the direct mount the holes are in the extruder body they are 13.5mm center to center.
Pneumatic fittings, I set it up to use 2 to give the ability to route PTFE tube to the filament reel however it will work without the fitting too.
The screw that holds the idler is there to hold the idler only not to hold the extruder against the motor just tighten it enough so the idler is in place correctly.
Use caution when threading the fittings into the extruder is easy to strip or crack the body.
Parts you are going to need...
1x MK8 Drive gear
2x Pneumatic fitting 1/8 to 4mm
2x 1/4" x 1/2" x .035" (6.350 x 12.7 x .889mm) Utility comp springs (Extruder to idler)
2x M3 Washers (Springs)
3x M3 Nuts (Spring screws, idler)
3x M3X25 Socket head screws (Extruder to motor)
2x M3X30 Socket head screws (Extruder to idler springs)
1x M3X16 Socket screw (Idler)