Is your Topping DX3pro+ a little too much Top? Does it need a good Bottoming? 

Do you dream of a desk where all the clutter is only clutter, and no useful things? Only me?

Anyway, these should be pretty self explanatory. Slide the front piece on from the back, then the rear. It is fastened by reusing the 2 screws on the back of the DAC.

If printed in a rigid filament (I chose PETG-CF) the front alone should be able to hold it securely.