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This is a method I use for repairing those prints that don't go as planned and for gap filling and modifying some of my prints, I use it as a modelling putty also.

I make an ABS slurry then add baking powder to the mix to make a stiff paste, usually more baking powder than ABS. Does not have the tendency to sink or get holes in, as straight ABS does, caused by I believe the Acetone evaporating.
I use it In all my model making as a filler as most people use the Tamiya putties.If it goes hard in the jar just add more Acetone.