Z Height Machinist Gauge Mount
thingiverse
When you have dual independent extruders, you can measure the differences between them to ensure the heights are the same. I'm using a inexpensive Fowler gauge found at this link. https://www.amazon.com/gp/product/B00B5HIXXI/ref=oh_aui_detailpage_o01_s00?ie=UTF8&psc=1 Certainly needed when using both extruders.
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