by flurin, published

Slim-Z-Coupling by flurin Feb 28, 2013

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There are countless Z-Coupling for 3D-Printer: rigid, flexible, printable and other variations. I'm using the Slim-Z-Coupling for a couple of weeks and I thought it's mature to propose this solution.


  • Slim and light.
  • No need of screws.
  • The Slim-Z-Coupling is rigid in the radial but flexible int axial-direction.
  • Easy to build with simple tools.
  • Using the Z-Support-Bracket ( http://www.thingiverse.com/thing:52388 ) you can reduce the force on the motor-shaft.
  • It reduces the Z-Axis-Wobble (additionally I recommend http://www.thingiverse.com/thing:42260 or a similar solution).

Update: Slim-Z-Coupling2.tiff (white background)


The goal of this design was an easy DIY Z-Coupling. You need a couple of tubes and simple tools.

1x Alu-Tube od=10mm, id=8mm, 40mm long
1x Alu-Tube od=8mm, id=6mm, 20mm long
1x Brass-Tube od=6mm, id=5mm, 20 mm long
1x Brass-Tube od=2mm, id=1mm, 10.6mm long

  1. Cut the tubes.
  2. Saw the slots (alu-tube and brass-tube).
  3. Drill the 2mm hole (10/8mm alu-tube).
  4. Insert the 2/1mm brass-tube into the 10/8mm alu-tube hole and expand the ends with a nail or an adequate tool.
  5. To fix the threaded rod use a tape in order to increase the diameter of the threaded rod to approx. 8mm (I used a blue tape) and press it into the 10/8mm alu-tube.
  6. With the sandpaper reduce the diameter of the 6/5mm brass-tube. You should be able to insert the 6/5mm brass-tube into the 8/6mm alu-tube with light pressure.
  7. Put the 6/5mm brass-tube over the motor-shaft.
  8. Press the 8/6mm alu-tubes over the 6/5mm brass-tube (don't use a hammer! ).
  9. Insert the threaded rod with the 10/8mm alu-tube into the 8/6mm alu-tube.

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Does this work well? I need a thin coupling like this but it's difficult to find reasonable lengths of metric tubing in the US. Any chance you could sell me one (or the components)?

Yes, this will work nicely.