Step 10Wait again. Then remove from the mold.
Check to see if it's ready. The epoxy should be dry. Not even tacky. Pull the mold compound away from the casting. If it opens a gap it should be ready. Use the very same technique of removing the drive as you did your own thumb. If you have no plans to reuse the casting, don't worry about it. Just yank! :)
Now you may want to carefully clean any compound still on the drive. Use a soft toothbrush and water. Don't scrub too hard! It's still not fully cured!
I discovered that epoxy is quite cruel to this molding compound. It's probably because of all the water in the compound. It you compare my first cast to the second, you can see that there are many more flaws in the second cast. These should be easy enough to clean off once the epoxy is fully cured.
Since we did add a water based material into the epoxy, it's going to take a bit longer to fully cure. Let it set at least 2 days before you clean the final product. Use an Exacto Knife, Razer Blades, Diagonal Cutters, what have you to trim any warts, threads, cancerous growths. A Dremel works nicely for final touch-ups.
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