Wade's Geared Nema 17 Extruder

by Wade, published

Wade's Geared Nema 17 Extruder by Wade Feb 10, 2010


A printed spur gear driven extruder for Mendel or Darwin.

Recent Comments

view all

is the filament hole for 3mm or 1.75?

I really would like to do it.But I don`t know the length.May I ask how long is the hobbed bolt,plz?

Is there a Nema 14 geared design for an extruder? It's a lot lighter, right? Would be a good option if possible. Would using 1.75 filament work better? I'm using your design with a 17 Nema, and it works really great. Thanks for such a good part.

Liked By

view all


Wade's Geared Nema 17 Extruder by Wade is licensed under the GNU - GPL license.

Give a Shout Out

If you print this Thing and display it in public proudly give attribution by printing and displaying this tag. Print Thing Tag


Construction and testing details on the RepRap wiki here:

This is a new extruder design based on Adrian's geared nema 14 extruder, with some ideas from Nophead's extruders. During testing it produced over 16 kg of pulling force on the filament. Hot end development is still ongoing, but it should plug and play with any existing 16 mm thermal breaks.


You must be logged in to post a comment.

Anonymous on Feb 9, 2014 said:

is the filament hole for 3mm or 1.75?

smnh58 on May 9, 2013 said:

I really would like to do it.But I don`t know the length.May I ask how long is the hobbed bolt,plz?

Anonymous on Nov 28, 2010 said:

Printed at FABLAB Manchester UK
gt; http://www.fablabmanchester.or...

Dimension 1200 Print options for Wades extruder body
gt; using http://www.dimensionprinting.c...

Print Options
Low density 30.45^3 cm
High density 39.00^3 cm
Solid 44.37^3 cm

Support material Options
Basic 11.37^3 cm
Sparse 11.66^3 cm
Smart 10.23^3 cm

I Opted for the lowest density with sparse support material as you pay £0.33 per cubic cm for both materials plus VAT so the
extruder body and Clamp was £18.05 inc VAT

Wade on Nov 28, 2010 said:

Looks great! Not cheap, but it is pretty. I'll have to look up the material costs on the reprap; I think it's on the order of a dollar or two.

mark on Oct 31, 2010 said:

I'm building my first 3d printer and bought nema14's by mistake. Will this accept nema14's or do I need to modify it?


Wade on Nov 1, 2010 said:

Nema 14's won't fit this design, and they probably won't have nearly enough torque even if they did fit - the steppers I use have 5 kg*cm of torque, although they are probably overkill.

coasterman on Oct 28, 2010 said:

It looks like the main block is pushing the limits of a makerbot build platform.

I'd LOVE to have this extruder, both because that it's a stepper extruder and can pull filament that strongly, but I either need to break the main block into two or find a RepRap operator near me.

Wade on Oct 28, 2010 said:

Spin it 45 deg around the Z axis, it'll print on a makerbot. Someone already uploaded a version like that to Thingiverse.

nicholasclewis on Oct 4, 2010 said:

I created a OpenSCAD version of the gears (http://www.thingiverse.com/thi... it is a derivative of a script by GregFrost and Thingiverse doesn't let you make something a derivative of more than one thing... so this will have to do as indication of my derivative. :)

jtbarclay on Sep 16, 2010 said:

Does anyone know what the printed volume of all 4 parts ends up being? I have access to a dimension elite at school and have to pay by the cubic inch. Meanwhile my plastruder mk4 spews more plastic out the side than the tip...

Wade on Sep 17, 2010 said:

From the skeinforge output of my last build:

M8 Extruder Block 3 - 30.4 cc

M8 Extruder Idler Block 2 - 3.7 cc

39 tooth gear - 10.1 cc

11 tooth gear - 1.3 cc

Those are calculated extruded volumes with my particular skeinforge settings, but I build them fairly dense. Solid densities will be at least twice as much or so, but you should be able to figure that out from the STL's.

Anonymous on Aug 23, 2010 said:

Has anyone had any issues using the MakerBot Nema 17's?

vnulk on Jul 28, 2010 said:

Can the second question - found the build article - sorry

vnulk on Jul 28, 2010 said:

2 questions:

Why resort to a machined bolt with much reduced surface area contacting the ABS (or alt material) as opposed to a larger dia design, ie. MK5 drive gear?

If the bolt is used as described, what is the source - readily available?

Absolutely thrilled with my BOT but always open to improvements! Particularly interested in ABS feed reliability.

Wade on Jul 28, 2010 said:

I couldn't get the MK5 drive gear easily in Canada, plus the smaller diameter (6.3 mm in my case) increases the filament drive force and resolution. And, with PLA at least, I get more than enough grip on the filament. 16 kg of pull works out to about 3600 PSI - that's at lot of pressure; I think the hot end will fail before you get that high.

These have turned out to be fairly reliable - neither of my two extruders have failed yet, and I hear Nophead had printed something like 18 + Mendels with his before it gave out. He did have a special hot end though, that put extra load on the mounting tabs, which eventually failed.

Things I'd l
ike to improve would include an easier mounting system (bolt under the stepper is hard to turn), and maybe a higher gear ratio like Adrian's version. Turning it sideways should allow a bigger gear and more Z travel.

MarcusWolschon on Apr 28, 2010 said:

A single sheet with this extruder and nopheads modification to be printed in one go.

casainho on Apr 16, 2010 said:

Hello :-) -- I started printing but I have 2 requests/ideas:

1st - design in a way that PTFE barrel can be fixed using screws and not glued, just like this: http://www.thingiverse.com/thi...

2nd - design the gear 11t17p to use a M3 screw and nut, just like this: http://www.thingiverse.com/thi...

Wade on Apr 16, 2010 said:

Request #1 is already there - use two m3 bolts through the 3 mm holes in the PTFE mount to pin the PTFE, like this:

#2 would be nice; feel free to add it. ;) I think Nophead has something similar in the works. Melting the gears on works great for me.

Anonymous on Apr 5, 2010 said:

Kysan Stepper Model# 2BYGH4803

nophead on Mar 13, 2010 said:

The holes and captive nuts in extruder block seem to be M4, but the holes in the idler block M3?

Anonymous on Mar 13, 2010 said:

I just re-measured the STL file with Meshlab, and the idler block holes come out at 4 mm diameter for me. The old Darwin I use to make these has slowish Gcode processing, and always makes the holes a bit undersized, so I habitually drill them out before use anyway, but slightly larger holes wouldn't hurt.

mattw on Mar 11, 2010 said:

Thanks Wade!

This extruder rocks!

laszlo on Feb 13, 2010 said:

Awesome. I was thinking about the same setup. You saved me a ton of work!


laszlo on Feb 13, 2010 said:

Ok, the M8_extruder_Block part is wrong. There supposed to be a hole where the big gear (with the M8 bolt) should go through.
See this picture:

For now, the hole which are nearer to the gear is a blind-hole.

Wade: why are you not creating this design in openscad?;-)
Maybe others could help to you.

rbisping on Feb 11, 2010 said:

realy glad you posted this here too. i did finaly find it on the reprap site but it took me a bit.
Been needing this for my bowden extruder expiriments. i realy hope that it has what i need to get that off the ground :)