Part 2 of my experiments with 3D printer extrusion issues that have been bugging me for months. As I'm designing my own extruder, I've gotten a bit obsessed about figuring out what's going on. In this episode we're looking at what I consider a design flaw for all dual gear extruder (that I know of) and how to potentially patch it up. I'm also explaining in detail how I determined what causes the wood-grain pattern on my specially designed 3D models. Sometimes the same issue can be called Moire pattern or salmon skin (and may or may not be the same issue).

Update: The printed parts have been printed using the original gears. However, the hobbed gears you see in the video are not the original printer gears. It was easier to film with some clones I had around.

Previous video on this topic https://www.youtube.com/watch?v=dL6u0UwPJOQ
Part 3 (intertwined waves) https://www.youtube.com/watch?v=UWuSsYKI-YM

Chapters:
0:00 Intro
0:35 The data
1:23 The wood grain pattern
1:52 The math
4:54 Theory validation
5:25 Dual gears explained
6:31 Dual gear design flaw
7:55 Solutions
9:02 Fixing the Prusa MK3S
9:49 When patterns show up
12:12 Other potential solutions
13:33 Further patterns

STL files for experimental idler doors for Prusa MK3S extruder: https://mihaidesigns.com/pages/inconsistent-extrusion-study

STL for PitStop extruder coming up with the PitStop 1.2 update (end of July).

Extruder test models http://mihaid.com/extrusion-test

Spreadsheet with the data provided by 3D printer users for this study https://docs.google.com/spreadsheets/d/1lu_dmUgIJuFcuuBmdSGbFpiL5Ja81NIMqiN8snIkPmo/edit?usp=sharing

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