Just a quick interjection- if you want a 3D design commissioned (like a model aircraft or tank), feel free to email me! For objects that take under half an hour to design, it'll be free! Prices scale up from there.

Gallery:

Tinkercad:

Horten 229
WWI Mark I tank

Fusion 360:

A few pictures of the RC P40

(see MODEL AVIATION for more details)
From top to bottom: Obj 279 (render), RC tank reloading animation draft, a proposed 3D printable RC Horten (abandoned)

From design to fabrication: (excluding the P40)

A bolt-action rollerball pen, inspired by the Lamy Dialog 1
A Montblanc-style fountain pen, with a nib made from a piece stainless steel tubing

FEA and CFD:

Stress distribution of a P40 wing under 80N of lift, or approximately 3 Gs. Minimum safety factor was about 1.8, which is more than enough at that load. Material: PLA Displacement distribution of a compliant wing, with about 6N of force applied to the two smaller spar holes. Material: PLA

(see RESEARCH & INTERNSHIPS for more details)
The same RC horten at 5 degrees angle of attack, with ambient airspeed at 15 m/s (w/ velocity vector graph)

Composite discus launch glider at 0 AOA, 15 degrees down-flap at 15 m/s airspeed (w/ velocity vector graph)

(see RESEARCH & INTERNSHIPS for more details)