Small footprint J-head quick fit extruder

by Wired1, published

Small footprint J-head quick fit extruder by Wired1 Sep 22, 2012


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Smaller version of Olekdh's extruder keeping all the good bits like the tilting screws, j-head lock plate and clean printing body.
The intention is to make an x-carriage that will take two of these either nose to tail or, if I can work out how to do it, mirror image.

I have rotated and moved the motor to allow the rear mount to be moved closer and shorten the whole baseplate, and should make it possible to mount these forward to back on the x-carriage.

Also has the standard 50mm spacing mounting screws too so will replace any standard extruder.

Quick fit latch here: http://www.thingiverse.com/thing:31528


Print out all the parts and fit them together, you will probably have to run a drill through the holes to clear them.

This is now a working extruder so I have removed the work in progress tag. Use the standard Wade gears from one of the predecessors.

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Corrected body STL uploaded, had a support material issue. I have deleted the earlier version of the body to avoid confusion.

I am having trouble printing this.  I tied slicing with both skeinforge and slic3r with the same basic issues.  First, the face down bearing opening offers no support for the smaller opening above it.  I can get around this by generating support with the slicer.  The second problem is bigger.  The part that the idler connects to is also printed without any underlying support.  It looks like you started to have something there, but both slic3r and skeinfirge render this as hollow which means 1) that it offers no support, and 2) the slicer does not know it needs to generate support.

You don't have source for this in anything usable do you? heekscad is by their own admission defunct, and it does not appear that freecad can open this type of file.  I've printed virtually every other piece I need for the OB1 printer; this piece is giving me fits.

I have uploaded the latest version of the body as well as the same file in STEP format which seems to be the only default file type we can all read. There is support material built in and it slices correctly on 0.9.3 Slic3r for me. Good luck and let me know if it still gives you grief :)

Thanks for the lightning quick response.  The slicing looked OK.  As soon as the gears finish printing I will give it a go - might be tomorrow.  Thanks for the stp file too.  I'm not too conversant in CAD programs, but if I need to I could probably struggle through what I need to do.

I wish all cad programs would use the same file format or at least put out in a step format so designs can be moved cross platform more easily.

I made the idler part longer on this than the original for one so I would guess that these parts will only fit for my extruder. All the parts you need for this extruder are here in any case. The .heeks files are for HeeksCad for anyone who wants to modify them and the STL's of course. The idler gear is held in with a 20mm length of 8mm smooth rod, it just snaps in place and stays there.

I fully intent to use all printed parts from your design. I was wondering only for the bearing, and the bit that grabs the filament. My motors have a smooth shaft without that flat spot on them. I might be able to put one then I can put a set screw instead of a rod I'm thinking. Does your motor shaft have a flat portion to it (key)? 
Thanks for the replay.

Some of the motors I have used are smooth like yours and the grub screw grabs OK but I would carefully grind a flat onto the shaft if I were you. If you buy new motors they have the flat spot.

Sorry to bother you again. I made this extruder and was wondering if i could use the parts from there on yours.
I am not familiar with the .heeks file format of your parts. Also is the idler gear held in place by a setscrew type thing?
I'm building a new printer and i want a diff extruder then the UM, hence why i like the compact one you made which i will install on a X carriage I will have to design. Makerbot style

Taylors Gregs Wades MK6 filament feed for Ultimaker

I assume it works with 3mm filament? 

Yes 3mm filament and hot ends.

Minor mod to the idler, raised the top slightly. Deleted the previous version to avoid confusion.

5 more iterations of idler and finally got it working right, once again I have deleted all the old files and just left the ones that work. Now to get on with the carriage...

really liking the look of this design ! and the idea of having 2 on a carriage will be amazing . printing out now to have a try later.

Yes that's the next stage although you see I have left the standard mounting screws there so I can use it now as I develop the carriage for a pair of them. With any luck someone else will beat me to it :)

Idler added, should fit better.

nice work, You may recheck tilt screws. they need more clereance upward and doesn't work best on my design

Yeah that's weird, the nut spaces are too wide too - I should have seen that in the original. Work in progress...

my printer wasn't calibrated correctly so 3 other i printed were to narrow so i added some space, in than I recalibrated a bit, changed slic3r and so on, but except those little things extruder prints great nozzle doesn't move or gets lose so i call it succes, when I will be building my mendelmax i will change those little things but till then i'll stuck with my design

I have redrawn the tension screws as M3 and they fit perfectly on the one I printed out. Redrew the idler again as it had a couple of issues. Deleted the earlier versions to avoid confusion.
I'll be using this on the MendelMax I'm building too :)