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You'll want to use enough infill to give it a lot of weight, which will greatly increase your print time but will also increase the weight. If you've got the money, definitely try Simplify3D, as it will let you say "100% infill up until 2cm high, then 20% infill after that" so you can make a really heavy base, but a lighter-weight body. Putting little rubber feet on the bottom helps too. :)