I just made a small screen for my exo Terra terrarium, a simple 24 X 18 screen. Took me over 2 hours. The worse part was inserting the screen and getting it tight. I'm just not cut out for that. The aluminum mesh would tear when I tried to use the roller tool and stretch it into the channel. I think I stabbed myself half dozen times with aluminum shards in the trimming. Kudos to those with the patients to to this.