Hi Rofl! Have you tried pouring hot water into the ingenuiTEA, like other conventional teapots? Sometimes my filter pops out, but if I heat my water up separately (which I prefer to do, as my microwave can be tempermental), and pour it in, the filter stays put.
Also, the ingenuiTEA fits on any sized mug- I have this huge 24oz mug that I drink my tea out of and I rest one part of the lift-up plate on the mug, and it drains out fine. Hope this helps!