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- johnip4 commented on matt.e.jenkins's instructable Making Aluminum Bronze: Melting Copper and Aluminum
- johnip4 commented on CrazySurvivalSt's instructable Futuristic Martian Tree Sculpture Made With Aluminium Poured in to Orbeez
- johnip4 completed the lessons Turning Your Photos Into a 3D Model, 3D Scanning Class, 3D Modeling Workflows and Cleaning Up Your 3D Model in the class 3D Scanning Class
- johnip4 commented on thecoolsundar's instructable Air Cooled 2 Stroke Cylinder Head Using Shell Casting
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