Update README.md

printed-stepper/README.md

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 The motor below was printed using <a href='https://www.proto-pasta.com/pages/magnetic-iron-pla'>Proto Pasta's Iron-doped PLA</a>, which has a relative permeability of around 10.
 
-<img src='printed-stepper.jpg' width=600px>
+<img src='fusion-design.png' width=400px>
+<img src='printed-stepper.jpg' width=400px>
 
 This directory contains STLs and a Fusion design file.