It's dangerous to go alone, print this!

My settings were (on PrusaSlicer):

Layer Height: 0.20mm
Infill: 100% (ocarina and collar) / 15% (stand)
Supports: Everywhere at 20° (Organic) - (ocarina and collar) / None (stand)
Brim: None (ocarina and stand) / On (collar)

I used the SPEED default and made those changes. I also printed my ocarina at an angle, adding support blockers and bolstering the base with some raft layers, first layer/raft expansions, and support enforcers - otherwise, I found it to be top heavy with some failed prints. Will be posting a screenshot of those settings, but those changed (in Expert Mode) were:

Support Material
First layer expansions: 10mm
Raft layers: 4
Raft expansion: 10mm
(Did also change First layer density from 90% to 100%, but that may not be necessary)

As well as:

Layers and perimeters
Vertical shells: Perimeters - 4 layers (minimum)
(mainly for aesthetic look with translucent filaments, though not sure if it effects sound quality)

I'll upload my .3mfs both upright and at an angle with support blockers, STLs upright and at an angle, and sliced GCodes for my final prints. I upsized the original Ocarina Stand to match the modified model, and the updated collar (from xUraB_ on Printables) fit at its original size. Feel free to try other orientations, support blockers, and raft combos to see what might print best (you will likely need to at least include blockers as to not have supports build in the mouthpiece). I did notice on some prints the lower/first few layers were a little more on the rough side than others.

I colored in the Triforce on the collar with a gold acrylic paint marker and sealed the darkness with a couple layers of matte modeling finish. To secure to ocarina, I used a little super glue around the collar interior then held it down until it set. It doesn't fit quite snugly, but snugly-ish.

Careful when slipping onto instrument as not to get glue higher on mouthpiece neck, it leaves residue. Also careful putting it too close to the top/bottom edges of collar interior, some seeped onto the instrument and after drying left that same milky residue. You could probably just put the glue on the lower-ish neck of mouthpiece, choose your own adventure!

And hey, listen! If you're going to scale, note that if you load in the instrument .3mfs, just be sure to have the instrument portion of the model selected before scaling (in Normal or Expert mode by selecting "Ocarina Remake.stl" via grouped layers drop-down in right-hand file editing column...it's the 2nd one down) - percentages vary with support blockers/enforcers included. Also, if you're going to play a scale, have fun with all the notes!

Model authors and license

To quote/paraphrase Mikolas Zuza (https://www.printables.com/model/65399-12-hole-playable-ocarina):

The original Ocarina was created by Nimaid. It was later remixed by RobSountrack to play better. Mystikal re-created the Ocarina stand that went missing in the original upload. xUraB_ created the Triforce collar (https://www.printables.com/model/1852361-ocarina-of-time-remake-ocarina) . I've simply bunched the files together and combined the new neck and remixed ocarina.

This original upload by Nimaid has a Creative Commons - Attribution - Non-Commercial - Share Alike license. So that's the license I respect and also chose for this print.

Differences of the remix compared to the original(s)

I combined the new neck/mouthpiece created by xUraB_ for the Ocarina of Time Remake with the ocarina from a combination of files gathered by Mikolas Zuza, then sized it up to fit the new collar (it had originally just slipped over/onto the model). The larger size and mouthpiece seem to produce a richer tone and is easier to play/grip, in my opinion - and it just looks cool.