Evaluation Molding and Casting
Group work: Very nice and detailed documentation. One thing, I recommend adding learning outcomes from the materials safety sheets. You can find them on the material's web page. In my opinion, the most important sections are: "Section 4 - First Aid Measures" and "Section 7 - Handling and Storage".
Ooomoo-25: https://www.smooth-on.com/products/oomoo-25/
Smooth-Sil 940: https://www.smooth-on.com/products/smooth-sil-940/
Smooth-Cast 300: https://www.smooth-on.com/products/smooth-cast-300/
Also, you can mention that the metal was Sn91Sb9 alloy with a melting temperature of around 235°C. This low melting temperature makes it possible to cast this metal into a silicone mold powdered with talc.
Individual assignment:
Very good and detailed documentation. And good results as well. In my opinion, for roughing process "Countour lines" works better, but you got nice results with "Scanning lines". I don't see a problem here. I would recommend to use printscreens rather than ptotos of the screen when possible. There's no need to remake them though. For better castings you can always poke a airshaft from the top of your mold.
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tag is missing after "I read the instruction sheet for the material. 100A:90B, 7 min to pour, 30 minutes to cure were the main points." text -
Please mention how long the milling process took. -
Please write a bit more what went wrong with the casting. Is the lower part smaller than the top one or is it just shifted? Your mold looks great so it is not clear what was the issue with casting. -
Add .stl file of the mold (try to keep size of .stl file as low as possible)