Perhaps the fotos here help: [First Batch Shipped Out] FAQs of Dual Extrusion 3D Printing Module for Snapmaker 2.0 - #99 by Hauke - also someone broke the pogo pins - check for that: [First Batch Shipped Out] FAQs of Dual Extrusion 3D Printing Module for Snapmaker 2.0 - #203 by Wyphorn