Expand your current filament dryer system.(Extension ring spacer only!!) This particular dryer has a 293mm lid flange DIA. check your dryer and I can customize my diameter to fit your machine. It will come 2-1/2" tall, these can be stacked multiple units. there will be minimal additional shipping charge on multiple items, they are bulky,, Please look at the drawings so you know how to measure.. PS one ring should allow you to use the dryer for two rolls of filament, you'll have to do some measuring, if you want something custom just let me know..