This is a remix of a less detailed Thunderbolt design by Hendar23 that is no longer available.
I have simply added detail to many of the surface to make it more visually appealing.
The version shown in pictures is printed at about 120% for use in Adeptus Titanicus terrain. Also pictured is a size comparison to an old Forge World Epic/Aeronautica Imperialis Thunderbolt (different to the 2019 edition of Aeronautica Imperialis version which is larger).
Unfortunately I haven't been able to get the engine intakes to print properly, particularly at Epic scale/100%. Probably some more work is required on this to make them more print-friendly (or use of a better printer/smaller nozzle). Not sure I will have time/inclination to fix it so feel free to remix with an improved version.
The print shown in images is the full model with supports. I have also provided the model in 3 parts which can be printed without supports (if oriented properly) but then needs to be glued together.