A patreon request: make a guide on how to add a second Z axis to an Ender 3. In this video we achieve that, showcasing three methods to get the gantry level. This includes a mechanical belt driven kit from TH3D, adding a 2nd stepper motor in parallel, and a 2nd firmware controlled stepper with G34 auto z levelling.

If you were looking to do this upgrade, hopefully one of these methods will be suitable for you!

Everything in this video was purchased with my own money. The links all point to TH3D for convenience only. 3D printed versions of the concept are linked below.

0:00 Introduction

0:42 Identifying the problem

1:56 Overview of the the three methods
3D printed Kazoo test print: https://www.prusaprinters.org/prints/...
Eryone Steampunk Rainbow PLA from X3D: https://x3d.com.au/collections/eryone...

3:06 Ender 3 PSU relocation
Thingiverse option 1 (used in this video): https://www.thingiverse.com/thing:460...
Thingiverse option 2: https://www.thingiverse.com/thing:342...
Thingiverse option 3: https://www.thingiverse.com/thing:330...
Thingiverse option 4: https://www.thingiverse.com/thing:451...

4:36 Option 1: Mechanical - belt driven leadscrew
Printed option by Scuddy: https://www.thingiverse.com/thing:345...
Printed option by Proper Printing: https://www.thingiverse.com/thing:374...
TH3D Ender 3 dual Z kit: https://www.th3dstudio.com/product/en...
TH3D installation guide: https://support.th3dstudio.com/hc/pro...

7:48 Alignment
TH3D printed alignment tool: https://github.com/th3dstudio/Unified...

9:39 Option 2: 2nd stepper motor in parallel
Spare stepper motor from TH3D: https://www.th3dstudio.com/product/st...
Stepper motor coupler: https://www.th3dstudio.com/product/up...
Parallel stepper motor adaptor plug from TH3D: https://www.th3dstudio.com/product/du...
My video on crimping your own connectors:    • Guide to crimp connectors on 3D print...  
Printed stepper motor holder: https://www.thingiverse.com/thing:318...

12:39 Flexible coupler to remove Z banding

13:09 Option 3: 2nd stepper motor with G34 auto alignment
Purchase the BTT SKR E3 Turbo:
Amazon: https://amzn.to/3g2YaM1
Aliexpress: https://s.click.aliexpress.com/e/_A9jjm2
My rear mounted universal electronics case: https://www.thingiverse.com/thing:368...

14:37 G34 minimum firmware changes
My video on setting up software to edit and compile Marlin firmware:    • Updated Marlin firmware setup guide -...  

14:56 G34 default behaviour
Marlin G34 reference: https://marlinfw.org/docs/gcode/G034....

16:11 G34 slicer start gcode change

16:28 G34 advanced firmware changes
Marlin M422 reference: https://marlinfw.org/docs/gcode/M422....

17:59 Conclusion - You on Kazoo!

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