In article ,
"Dave Plowman (News)" writes:

It depends on the plastic. But unless it's one where there is a true
solvent like say perspex,it's unlikely you'll get a strong as new repair.

I had a plastic lug snap off one of the internal shelf doors in
the freezer. This looked like it might be a problem to glue, so
I melted the two surfaces quickly over a gas flame and pushed
them together, and it's been fine for the 10 years of use since.
Obviously, this only works with thermosoftening plastics.

--
Andrew Gabriel