Giá đỡ bàn phím đôi (Double keyboard stand)

I modified this keyboard stand for my father because he wanted the top keyboard to be angled lower for better ease of use and the only way I figured was to remake it in onshape with the changes my father needed. I decided to use a slider to add adjustability to the two stands which I secured with a press fit to the stands. 

I was able to fit the sliders with no scale adjustment, but you may have to test the scale to get the fit right. I used 4x M5 x 14 bolts and nuts to secure the sliders together and hold them in place. I'm sure that 3D-printed bolts should work; I just had the bolts on hand.

I made two different extension pieces to extend the distance between the stands and due to my design, the maximum extension is limited by the length of the original adjustment. I'm sure there is a better solution but this was perfect for my father's case.