I have projects I want to do this weekend and I ran out of bed tape. I order some but the sheets will not get here till mid to late next week. So I did the next best thing. Laugh if you must but it works, color the blue tape black. As may already know the sensor on the Robo C2 does not like blue tape "Does not work with blue". With the Robo C2 tape my Z Offset on the average is 4.8 to 5.2. With this coloring trick it is different about 6.2 to 6.9, but it works. I not saying I want to do this all the time it is a lot of coloring in. The blue sheet shown is a shaxon sheet can buy them at my local Frys store.