About this 3D model
Here's a really quick and easy 3D-printable screw-in front lenscap design, set-up as a customizer application. Less than $0.15 worth of materials are used to make a typical size lenscap, yet they work well and can even double as color references.An Instructable gives the details: http://www.instructables.com/id/3D-Printed-Screw-In-Front-Lenscaps/ Note: An improved version of this is now available as https://www.myminifactory.com/object/33111