Oh we do have a Michael's here. I will check that out as I've been looking for a hot knife for ages now...thanks!

The only design change we made was to wire the hardware cloth to the inside of the tub rather than the outside. We did see a tiny bit of chewing out so with that change, it's stopped that going on. Other than that I love the tubs. They offer a lot of room and are so well ventilated there is really no ammonia build up at all. Especially in my male only feeder tubs, that's an important thing with many male rodents in one area.