Iron, Steel, Tin, and Pewter from the Era 1 Steel Alphabet from Brandon Sanderson's Mistborn series. I plan to upload the rest of the Era 1 metals and then the Era 2 metals.
Took the images from the coppermind.net wiki and made them into 3D objects. I printed these by making the wider of the width/height 100mm, and then extruding the height to 10mm. They came out alright, the sharper edges are not perfect, so consider making them a little bigger.
The thumbnails are upside down, look at their entries on their coppermind.net pages to see their proper orientation.