Provides a quick and effective way of disabling the CNC machine if an emergency occurs. The stop button can be bought through the likes of Amazon or Aliexpress. The one I purchased is: 

[https://www.aliexpress.com/item/32672562816.html?spm=a2g0o.productlist.0.0.1e424bb2d7Hr2T&algo_pvid=b796b823-9845-4d0e-ae25-9307c8b87932&algo_exp_id=b796b823-9845-4d0e-ae25-9307c8b87932-0&pdp_ext_f=%7B%22sku_id%22%3A%2260179620831%22%7D&pdp_npi=2%40dis%21EUR%21%211.37%21%21%21%21%21%402101d64d16533125183058648e47f8%2160179620831%21sea](https://www.aliexpress.com/item/32672562816.html?spm=a2g0o.productlist.0.0.1e424bb2d7Hr2T&algo_pvid=b796b823-9845-4d0e-ae25-9307c8b87932&algo_exp_id=b796b823-9845-4d0e-ae25-9307c8b87932-0&pdp_ext_f=%7B%22sku_id%22%3A%2260179620831%22%7D&pdp_npi=2%40dis%21EUR%21%211.37%21%21%21%21%21%402101d64d16533125183058648e47f8%2160179620831%21sea)

There is also an optional backcover that can be printed for the mount.

It is attached to the aluminium extrusion by the use of two 10mm M3 bolts and two M3 T-nuts.