If you make this please share how you used it - thanks ! my own quick holder for my galaxy s5 to attach to my 60x spotter scope - the eyepiece is 36mm diameter and this should slide over. at the moment i am attaching with rubber bands with the pegs i have put on the board - i will try later to add a proper holder for the phone, although at present this might be usable with other phones with a center camera placing. I have now printed this and apart from the inner diameter being a bit bigger than i wanted ( i think my printer needs better calibration ) it all goes together great And i am very impressed with the images i got on my phone of local fields. so i am hoping to get it to work with some astro photgraphy later when the sky is clear This is only my 2nd design and still trying to get to grips with the software.printed with .30mm width at 10% fill in PLA 2 shell jjust print and attach phone with rubber bands