This model has M4 holes to attach rod / threaded sleeves between. I used 100mm, M4, 7mm OD as shown in the image:
https://www.ebay.co.uk/itm/394846914695?var=663411971048
I wanted a narrower stand to support split keyboards (as shown).
There is only one file, please mirror the model in your slicer to print the left hand side.
I printed mine in matte black PLA:
The author marked this model as their own original creation.