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Z axis mod for Reprappro mendel mono or tricolour

20130720_185816[1.jpg Z axis mod for Reprappro mendel mono or tricolour
Nut_case.jpg Z axis mod for Reprappro mendel mono or tricolour
Nut_case.stl Z axis mod for Reprappro mendel mono or tricolour
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  • Nut_case.stl

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3D model size X 30 Γ— Y 17 Γ— Z 23.5 mm
Publication date 2021-09-12 at 23:13
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Published to Thingiverse on: 2013-07-20 at 14:40
Design number 518250
mrwolfe

mrwolfe

3D printer file info

3D model description

The M5 nuts on the Z axis have a small amount of play (~0.5mm), and if the X axis belt tension compensation screws (at the idler end) aren't absolutely perfectly adjusted (I still don't know where that sweet spot is) the Z axis hangs up on the thread, which can lead to Z axis inaccuracy. This mod adds a second nut at the motor end to remove the play.

3D printing settings

  1. After printing it, remove the Z axis motor at the X axis motor end (see the pic) and unscrew the threaded rod. put a second M5 nut in the nut case (leave the spring where it is for the moment)

  2. screw the rod through the nut case and into the original (lower) M5 nut, leave some space for the nut case to move up and down a bit.

  3. Thoroughly clean the flange on the nut case and the top of the X axis motor mount with acetone or MEK. Alternatively, I used a superglue primer.

  4. Superglue the nut case in place, making sure there is space around the threaded rod.

  5. Once the glue has set, unscrew the rod and move the spring from its original position to the slot in the nut case.

  6. Screw the rod through the upper and lower nuts. Make sure the spring is slightly compressed such that there is a small gap above the upper nut when you let the rod go (0.5mm is good)

  7. Reassemble the Z axis motor and realign the Z axis.

NOTES:

After using this for a while I started having problems with the bed going out of level. After much investigation I found that it wasn't the bed at all, but the Z Axis motor at the X drive end losing steps. It turns out that you only need a very small amount of pressure on the second nut to take up the slack. Because I didn't have another spring, I used the one originally supplied with the MonoMendel kit. The result was that as the nuts get dirty, the drag on the Z axis motor increases until it starts losing steps. I'm still looking for a fix, but there are some things to try:

  • Use a low viscosity lubricant such as sewing machine oil
  • From time to time disassemble the Z axis and thoroughly clean the screws and nuts
  • Make sure the X axis belt tension screws are adjusted to allow the Z axis to slide freely on the rods.

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