Extended Kossel J-Head Mount

by mmccool, published

Extended Kossel J-Head Mount by mmccool May 3, 2013
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Extended Kossel J-Head Mount by mmccool is licensed under the GNU - GPL license.

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An extended "universal" version of the "easy adjustable" J-head mount with various improvements, including a printable Bowden clamp, option for fusion with effector, and support for one, two, or three hot-ends.


NOTE: not yet fully tested. I have printed and test-fitted, but I'm still assembling my Kossel. In particular I don't know if the Bowden clamps will be strong enough. Note also that this is appropriate for the "legacy" Kossel and will not work with the current version in the git repo, which now uses a smaller effector. Files for the legacy Kossel are at https://github.com/jcrocholl/kossel/tree/legacy. I do include (a slightly modified version of) the effector from there in my download (for visualization purposes, but also to print fused with the top plate as an option... saves three bolts and their weight).

This is a universal J-head mounting system for a Bowden cable effector for the legacy Kossel. You can mount one, two, or three hot ends. The mounting plate is universal and will work with all three versions of the insert. You can also adjust the leveling by adjusting the mounting screws. In addition, there are printable Bowden clamps. For these, pick either the single or double-high version, depending on how paranoid you are, and mount them using a countersunk bolt pushed up from underneath the plate and one or two cable ties.

WARNING: Many electronics, i.e. the RAMP1.4, only support dual extruders at most. You will have to be creative to get a third extruder working.

Improvements over the original:

  • Mounting holes now line up with holes on effector.
  • Recessed nut captures on bottom now have cathederal ceilings to print better
  • More space around insert to allow it to be adjusted better
  • Larger nut captures and holes that work with M3 bolts and nuts
  • Large enough hole for either a 4mm PFTE Bowden tube or a 8mm push-mount
  • Universal hole system. Note that sometimes you use a hole for a mounting pin for the insert, sometime you use it for a Bowden mount. Feel free to use any extra holes for cable management.
  • Option for fused effector and mounting plate.

Update: Pictures, option for fused plate/effector.

Update 2: License for effector is GPL (see git repo referenced above), license for original mount was Creative Commons - Share Alike. I'm not sure what the resulting license should be, but for now I'm making the whole thing Creative Commons - GPL, which I believe is more restrictive. However, really everything but effector.scad, configuration.scad, and fused_plate.stl should be Creative Commons - Share Alike. Someone please correct me in the comments. I suppose I should split out the files with the GPL license into a separate thing...

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Just what I am looking for, I am not an expert at CAD, but I was thinking that the only thing missing was an integrated level probe option now that marlin supports it on a delta. Preferably through the center of the effector on dual and triple configurations and off center in the single configuration. And possibly a home retract in the sketch. Do you think that would be difficult? Or is it already in your inventory for development? I was going to try using the Allen wrench type of auto level build but Hall effect and optical are also an option obviously.
(I only have the hardware for the Allen wrench style atm and was thinking that a ball ended style would yield more precise result. )
Even though the auto assemblies are quite light I think that center of mass and the center of the effector should be as close as possible.
Thoughts on the above? Also what material do you think would be be best, #of shells, infill etc do you plan on using.
I fear even attempting a remix since so much careful work has been done on this. What a great upgrade to the standard delta effector!
Really great work.

THIS IS AWESOME !! correct me if i'm wrong but is that a adaptation for 3 filaments going into one single nozzle(hot end) ? if that is so, is there any software to suport such an upgrade ?
oh and is there any shorter "grey thingy" holding the nozzle?(so that to gain more z space)
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Not 3 filaments into a single hotend.. 3 filaments into 3 separate hotends. So.. like 3 color printing. Downside.. most boards only support 2 hotends.

Added pic of fused version. This is what I'm planning to use for my Kossel build (at first; once I get a single hotend working, plan to swap out insert to support multiple hotends). BTW, for the one-hotend option you only need to use the lower nuts, and can leave out the top nuts, washers, and spring, since those are only needed for leveling multiple hotends.

Ridges inside Bowden clamp are just ridges, not screw threads. What I should do is us real screw threads there, and then you can use a tap to put corresponding threads on the outside of your Bowden tube. To do...

By the way, to save weight, you can take the union of the plate ("ring") and effector in SCAD and print them as one