The main board case uses 2 M3 screws. You will need to use a tap and die set to get the threads nice. The CC1101 case uses a single M3 screw. The NRF24 case uses a small blob of super glue to ensure the case stays together.
Print in something that bridges well and has good layer adhesion. You don't want to split your print with the screws.
No supports needed.
Link to REK5LAB Board
The author marked this model as their own original creation.