About this 3D model

My design https://www.myminifactory.com/object/33084 was 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/ . This thing is improved in three ways (demonstrated with the green cap): This uses the new OpenSCAD font support, so you can specify the font used for labels... and you can now have 1, 2, or 3 lines of text. This version doesn't use the Write.scad library. There is now provision to specify a turn (rotation) of the screw thread to ensure the text labels stop right-side-up when the cap is screwed-into your lens filter thread. This now integrates the QR code generator http://www.thingiverse.com/thing:258542 so that you can imprint a QR code label on the inside of your lenscap. Why do that? For starters, you could use it to ID which adapted legacy lens you're using by simply taking a photo of (or including) the lenscap whenever you swap lenses.