FINALLY, an easy, safe, error free filament printable SOT egg!
CAD files included so you can modify or add variations.

Designed for filament printability:

-Smooth flat bottom for strong buildplate adhesion
-Limited overhangs where I could to 60 degrees
-Solid, watertight model without errors
-Jewel clearance of 0.2mm

Recommended Slicer settings:

-2 walls/shells, Inside to Outside
-Z Seam: Sharpest corner, Hide
-4 Top layers, 3 Bottom
-Travel: Not On Outer Surface
-Top/Bottom Pattern: Concentric
-Bottom Pattern Initial Layer: Lines! I had trouble starting first layer until I found this setting in Cura. You will have to Configure Setting Visibility and check the box, then change

-Bottom Pattern Initial Layer to LINES. First layer does NOT adhere well when starting a spiraling circle from center. But ALL the rest should be Concentric.

-Infill: 17%, Grid Pattern, Skin Edge Support Layers = 1
-Experimental: Make Overhangs Printable, Maximum Model Overhang = 60 degrees

-Jewels:
Infill 10% GRID
2 walls / shells
Top/Bottom Pattern: Concentric
Bottom Pattern Initial Layer: Lines!
*Speed: VERY SLOW! With such small buildplate surface area and part size, patience is key. I limit mine to 25mm/s

IF USING CURA, and you have vertical lines of bumps around model, it is NOT from model design infill or Z seam! When I sliced with different program and printed, they disappeared and model was perfect! So try a different slicer if you see them.

Scaling larger should not be a problem as long as you scale egg AND Jewels the same scale