Yep, practice on scraps for heat gun. Go easy with heat from a distance. Check if ABS bends where you need it, if not, repeat. When I did use my heat gun effectively, I also tried to create a heatshield using wood or other materials to protect the surrounding areas and isolate the heat. This worked for bending the back of shin overlap so it laid flush on Velcro. But, It is not an exact science. Water bath is safer. But again, practice.
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