Thought it might be good to have perforated upper plate risers for the V400 for better ventilation.
I wrote a little OpenSCAD file to create lines of cylinders as hole punches, and used Microsoft's free 3D Builder to edit the original STL files. To create the vents, I imported and positioned the cylinders through the original object drawings, then subtracted the cylinders.
Printed with PETG, 20% infill. Gcode file prints all three of the risers on the MK3S+
See also Vented Riser Sides for Flsun V400
https://www.printables.com/model/393885-vented-riser-sides-for-flsun-v400
The author remixed this model.