I designed this in Fusion 360 for a piece of maple that I'd like to CNC carve. I was surprised that no one had a 3D version of the United Methodist symbol on Thingiverse, so I hope others can make use of this. In particular, to highlight the wood grain, I've tapered the cross and added height curvature to the flames (extrude the flames, then cut with a B-spline plane). I have provided the DWG (CAD format) file if you'd like to improve on it. The improvement I added since creating the DWG are three small supports to reinforce the flame. These supports are included in the STL file.
I printed at 4x scale, resulting in a 4 3/8" long cross. On a Prusa mini, at 4x scale and set for detail at 0.10mm layer height, the print took 2.3 hours.

Prusa

I3 MK3S

No

No

15% or more

No supports needed. You may want to scale it larger. As-is: 17.9 x 28.6 x 2.8 mm. 1580 facets in the STL file.