Thank you so much for this design. It works perfectly on my highly customised Monoprice Mini Delta.
Cooling is perfect and overall design thought through and just looks great.
The only manual adjustment I had to make is drill-through the holes for arm joints. Sine none of my M3 nuts would not go into the designated places no matter how hard I try, so decided keep it simple and drill-through the holes and use a M3 rod. To my understanding, the rod approach is better anyway, no risk the arm joints not being on the same line due to bad assembly or plastic properties (with time or just printed from start).
Another problem was the duct is challenging to print due to its very thin top and small angle (in print orientation, that's bottom when assembled). It printed with little holes, would prefer to have it a little thicker so at least 2 layers are applied everywhere.
But that's minor. If you care to post source CAD model I can probably edit it and make a rod-mount remix to save some assembly time for me or others.
Printed in ColorFabb NGEN and ESUN HIPS.
The body is NGEN, duct is HIPS, just because could not manage to print duct nice with NGEN, top is too thin.