Scissors handle for real scissors. This is a replacement for broken part. It can be customized for different scissors.

Print in harder TPE/TPU which makes handle unbreakable. Use more perimeters (5) to avoid bending during use. Hard press it on the steel end. You can secure it by a superglue.

Or use PETG which should work well but you need hairdryer or heat gun to soften the material before pressing it on.