This model, not to be confused with my Airplane model (
https://www.shapeways.com/product/U8G5C7DKC/airplane?optionId=63816404&li=shop-inventory), is the geometric plane, the 2d one. I'm sorry if it's too fat to be considered a plane, but that's how I like it. To make this, I opened
https://3dc.io/app/, and I clicked Add->Plane and changed the parameters up a little bit. Then I clicked the Menu button on the top-left of the screen and scrolled down a tiny bit, then clicked "export .stl for printing". A "Recent Downloads" bar appeared on the bottom of my screen and there was model.stl on it. Then I
went straight to https://www.shapeways.com/mymodels and clicked "Upload" on the top-left of my screen. I dragged my "model.stl" stub onto the "SELECT FILE" button then clicked on the "SELECT A CATEGORY" dropdown. I selected Toys->Tabletop & Wargaming and then clicked "Upload" on the bottom-right of the "Upload" popup. When it started uploading and I found out the X-Y-Z parameters, I scaled my model to a small fraction of that.