Please assure yourself that you're using 0.1 mm layer height and printing outer perimeter first.
I realized that there are some unsupported overhangs. I created internal supports that don't need to be exctracted after printing as many people don't have access to dual extrusion printer.
There is no need for soluble filament for support!
Almost every FDM printer should be able to print this!
Make sure xour printer is dialed in properly as this is a very complex model.
For further information please check out the original model by Anton Granata.
Here are some pictures of the support technique I used:
The author remixed this model.