Modified Z-Axis Tensioner for the SimpleCore Redux

Improved z-axis carrier and idler with two tensioner screws
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updated November 25, 2025

Description

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Modified z-axis carrier and idler for the SimpleCore Redux. The original single tensioner screw and captive nut have been replaced by two screws and threaded inserts. This carrier and idler is a direct replacement for the original part and uses the same 5x20 dowel and 20T idler wheel.

Additional parts needed are:

  • 2 x M3x4.6 threaded inserts
  • 2 x M3x25 bolts for approx 10mm adjustment, OR
  • 2 x M3x30 bolts for approx 20mm adjustment

No other parts need modifying. 

Printing instructions are the same as for the original:

  • 4 Walls - 4 Top / Bottom layers 
  • 30% Gyroid infill 
  • ASA/ABS are recommended, use PETG-CF as a minimum!

Model origin

The author remixed this model.

Differences of the remix compared to the original

  • Replaced the single tensioner screw with two tensioner screws
  • Modified the idler design 
  • Modified the carrier design

License