Easy adjustable Rostock/Kossel J-Head Mount

by mattschoenholz, published

Easy adjustable Rostock/Kossel J-Head Mount by mattschoenholz Dec 17, 2012
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As I worked through the assembly of the Kossel ( http://reprap.org/wiki/Kossel ), an OpenBeam based Delta style printer, I decided to build it with dual extruders/hotends and wanted to use the M5 PushFit connectors available from Amazon or TriDPrinting ( http://www.tridprinting.com/Hot-Ends/#3D-Printer-Push-Fit-Fitting )

This part allows the J-Head to snap into place and fits within and will bolt right on the current effector/platform for the Kossel and Rostock.

Updated SCAD file to better fit the inside circle of the Rostock effector.

Update: V2 of SCAD file corrects the misalignment of the single J-head on the insert vs the plate.


The OpenScad file has a variable (printDual) that allows you to specify single or dual hotends. Set this variable and print.

I used PLA with a 0.5mm tip, 0.12mm layer height at 95% infill.

There are 4 captive nuts on each side of the insert which enable you to adjust the height of the hotends on a dual setup. After identifying which, if either, of the hotends is low, I turn the screws on the opposite side counter-clockwise equally. One full turn of M3 bolts is .5mm, you shouldnt need much to get them level.

Required Hardware:
1 or 2 J-Head MKV
1 or 2 PushFit/Pnuefit connectors
4 M3 X 12mm
2 M3 X 20mm
10 M3 Nuts
6 M3 Washers

I am using this with the modified AirTripper Extruder for PushFit and Planetary Gear Stepper: http://www.thingiverse.com/thing:38069

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I know this is old, but what is the exact distance between the holes for the dual extruders? I don't have a digital caliper.

The centers of the J-Heads in the dual version are too far apart such that the insert will not fit into the Rostock platform. Since the circumference of the PEEK of the J-head fouls the hole in the platform that the insert fits into.

Did you try my derived version? I tweaked it quite a bit.

No haven't tried yours. Will give it a go though thanks

Great design, you read my mind! I just published a derived version with several improvements, including printed Bowden clamps and support for triple extruders (if you can configure electronics to support that...), and some improvements for printability. BTW, in your version your mounting holes were a little off, so I just gave it the same 20 holes as the effector.

The single jmount doesn't appear to line up with the center hole on the cap piece.

I just uploaded the corrected files. Sorry about that. I had fixed it and had not had a chance to upload the revisions.