De or het raamsponning?

The correct Dutch article is:

de raamsponning

Rule Words ending in -ing: almost always de. See the rule

How to use raamsponning

the raamsponningde raamsponning
this raamsponningdeze raamsponning
that raamsponningdie raamsponning
our raamsponningonze raamsponning
your raamsponningjouw raamsponning
every raamsponningelke raamsponning
which raamsponning?welke raamsponning?
a big raamsponning / the big raamsponningeen grote raamsponning, de grote raamsponning