This SMT connector is the perfect fit for the micro:bit, it has 2 rows of 40 pins making a total of 80. It also has 2 locating columns to make lining up the part to your board a breeze.
You can download our Eagle CAD library here : https://github.com/proto-pic/micro-bit-eagle-libraries
Please note this it the surface mount version of this part
Step file 3D model Right click and save as