This is a replica of a classic Ral Partha miniature, 01-017 from the "Personalities and Things that go Bump in the Night" series. The spear was missing from my model, so I reconstructed it based on the photos linked below using Blender. The tail was broken on my model, and when I glued it on for scanning it seems I did it backwards. I have included a modified STL of the Pegasus with the tail on correctly.
A complete all-in-one STL is included, as well as individual files for the Pegasus, Rider, and Spear. The original model came with the wings also a separate piece, but I did not scan them separately.
See http://www.miniatures-workshop.com/lostminiswiki/index.php?title=Image:RP-01-017v2.jpg
"Pegasus and Rider"
Note: I reused the wings of this model to scan https://www.thingiverse.com/thing:5963784
Reproduced using https://www.thingiverse.com/thing:1762299
Printer Brand:
Monoprice
Printer:
Maker Ultimate
Supports:
Yes
Resolution:
0.1mm
Infill:
100%
Filament:
Hatchbox PLAgray
Notes:
Most models should have Z axis set negative to make the bottom flat, but the rider should actually be floating above the build plate. All models require support.
Closeup of the rider

The author marked this model as their own original creation. Imported from Thingiverse.