Creality filament sensor shim/bracket for Redrex extruder

This is a shim for the Creality filament sensor to raise the filament to the level for entry into the Redrex extruder.
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updated June 18, 2023

Description

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The ubiquitous red bodied Redrex aluminum extruder (single or dual gear) has a filament entrance hole that is much higher than the original or all-metal Creality extruder. This is not an issue until you also want to install Creality's filament sensor. You will then find that the filament will have to bend sharply upward to enter the Redrex extruder filament entrance hole, so much so that you probably will not be able to load the filament, and even if you managed it, the drag on the filament would be so extreme that the extruder probably wouldn't turn.

This filament sensor fits the Creality:

  • Ender 3
  • Ender 3 Pro
  • Ender 3 Max
  • Ender 3 V2
  • Ender 3 Neo
  • Ender 3 V2 Neo
  • Ender 6
  • CR-10S Pro
  • CR-10S V2
  • CR-10 V2
  • CR-10 V3

This is a shim which raises the filament sensor to line up with the Redrex extruder entrance hole. It has holes which accommodate the Creality filament sensor and allow it to be secured to the Creality extruder bracket.

Speaking of the bracket, Creality missed a trick here. The original bracket had a big slot in order to secure the cable to the extruder bracket with a cable tie. Creality's replacement bracket does not have this, so I designed one into the shim.

The slot ends up rather close to the extruder arm, but most of it is still exposed and I can operate the arm fine.

You'll need 4 X 30mm M3 screws to secure the filament sensor through the shim to the extruder bracket. The Creality-supplied screws will be way too short. 25mm screws might just make it if you were able to find countersunk head screws - I was only able to find pan head screws and the 25mm pan heads don't sink deep enough before bottoming out.

This is a structural part so I used 50% infill for strength. Since there's not a lot of detail and it's not meant to look nice but to be strong, I used 0.20mm layer height. 0.28mm layer height might work as well. 0.12mm layer height would be unnecessary and might compromise the strength. Any filament type will do, except TPU I suppose! I used PLA-F.

So that's:

  • 50%+ infll
  • 0.20mm layer height
  • No supports
  • No brim
  • No raft
  • PLA, PLA+, PLA-F, ABS, ASA, PETG, HIPS

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