From my perspective, a honey "making" machine based on squeezing combs is a bad idea, to be avoided. Bees use about 10 times the amount of honey to make wax, so a system to extract and re-use honey combs significantly 1) increases productivity, reducing labour for 2) bees and labour for 3) beekeeper: win/win/win. Cost is the only downside, but good extractors are available from China at a price that cannot be reduced in a self-made device. Stainless steel is the material to use.