This is a sturdy version of the paper template provided by iRobot on their web page for the Looj gutter cleaning robot. It won't tear, warp, or get soggy. A convenient handle is included to keep your hand clear while checking the clearance. Will hold up under repeated use, as when replacing gutters. Easy to print and Openscad source code is included.Printed in ABS on a Printrbot+. Cooling may or may not be needed on the handle part. Support is not needed. A brim is recommended to keep the edges from curling - you want a nice flat rectangle.