top = 1/4" lexan cut to 16.25" x 20"
upper box = old 10 frame medium hive body retired due to corner rot painted flat black
lower box = old 10 frame deep hive body retired due to corner rot painted flat black
(two 10 frame mediums will work just as good)
used an old piece of plywood cut to hive body outer dimensions and nailed on the bottom of the lower box
inside and sitting on the floor is an $11.00 tupperware type 'gasket box' from the dollar store having these dimensions:
18.5" x 14.88" square by 11.13" deep
it just so happens that this size gasket box slides comfortably down into the inner dimension of a 10 frame hive body leaving minimal clearance almost like it was engineered precisely to do so.
resting nicely on top of the gasket box is a metal queen excluder robbed out of its wood frame and it also is a perfect fit into the inner dimensions of a 10 frame hive body.
the process is simple, clean, and energy efficient. the result is perfectly clean wax that can then be melted for a myriad of purposes but is already perfectly clean.
the process is put about 3 - 4" of water in the bottom of the gasket box.
place the excluder on top of the box.
place a single layer of household paper towels over the excluder.
place your cappings (or old comb or whatever beeswax you have) on top of the paper towel.
this particular prototype ends up holding about 18 medium frames (2 ten frame medium running 9 frames per super) worth of cappings wax.
it's a slow process and depends on how sunny it is but a couple of days or so per batch is what the first batches took. the water acts as a cold sink and it takes a fair amount of the morning sun to bring the water up to temp and that's when the wax melting begins in earnest.
the melted wax seeps through the paper towel and drips down into the water below. you end up with nice looking clean pieces of wax. if you retrieve the clean wax while it is still warm you can squish it into any shape that works for you.