This is 100% taken from the idea by Keith's Test Garage and the HoleyDesk Project.

https://www.thingiverse.com/keith204/designs

https://www.holeydesk.com

When you come to drill the holes in your desk, use this to mark them out and ensure you are at 96mm hole centres.

I've made sure there is a cross on each point to allow you to better orientate yourself and also to make it easier to go at a right angle.

I've also added a hole at 50mm from the edge to make it easier to mark out for the steel strip (50mm is nice and standard in the UK/EU).

Creality

Ender 3

No

No

200

20

I use 02mm settings in Cura.