I recently bought the oven and was really pleased with the consistent results. I did a purge to get rid of any wraps causing less than perfect results. However just a few batches in and some of the mugs are coming out either slightly faded or slightly blurred in areas (like you describe). I've recently started leaving the mugs to cool with the wraps left on as suggested in the oven thread, but today I'm wondering if this slightly 'baggies' the wraps and although I'd purged the poor wraps, I've possibly damaged a bunch more wraps.