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) Solder or Wire
If you want maximum weight in a small amount of space, solder is one of the best options. Just be smart about it—melting solder doesn’t work for flammable or meltable builds, but plain wire can be bent up and stuffed inside if you don’t have the full setup.
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Pros
- +Excellent weight per square inch
- +Can add a lot of heft without needing much volume
- +Wire is a simpler alternative if you can’t melt solder
Cons
- -Not suitable for flammable or meltable projects
- -Requires extra tools/handling if you’re melting solder
