Folding adjustable Kindle stand, metric

I tried several Kindle stands which didn't really quite work for me, because I wanted one I could adjust and carry around.  Then I was inspired by a portable stand designed by kdpainter, though it didn't quite fit mine. 

I created this from scratch in Fusion 360, to use metric hardware (two M4 screws for the arm pivots and an M6 bolt for the adjustable barrel).  I've been using it daily for over two years; it's pretty robust.  It's fully parametric, so easy to change the slot size for different models and cases/covers.  For convenience I've included a few common sizes of barrel with slots for different Kindle/case models.

It can be used in either left-handed or right-handed orientation, and the tilt angle is adjustable over a wide range.  The arms clip into place along the body when folded.  It's been so successful that I've been asked for several more by family and friends.  So far I've printed almost a dozen, in colours ranging from the dark blue in the picture (my own original) to brilliant orange, and even one in very shiny green Silk PLA.

The design which inspired my version is by kdpainter on Thingiverse, and I'm grateful to Kelly for allowing me to create my own and publish it.

Printing notes

The individual parts are saved in the correct orientation for printing.  You will need one frame , one barrel, one knob, two arms, and hardware listed below.

The main frame body should be printed upright with support (which will be easy to remove, and any marks will be hidden by the knob).  The barrel should also be printed upright for reasons of strength and aesthetics; it needs no support.  Two arms are required; they may be printed with support for the deep countersinks as the edges will be slightly above the build surface to ensure they're properly recessed (as you can see in the orange arm).  The recess ensures the screw heads won't scratch a tabletop.  The supports will be quite small and I've always found them very easy to remove.

Clearances have been included on all the parts so that everything fits together neatly without binding.

Tip: if you're not sure about the best slot width, sink the barrel through the build surface in the slicer, and just print the top 20mm.  Test for an easy sliding but not too sloppy fit with your Kindle.

I print these in PLA.  If using silk PLA, make sure you set a high enough hotend temperature or the layer adhesion may not be good enough for robustness.

Hardware

Qty. 2:    M4 x 10mm countersink screw, one for each arm pivot.

Qty. 1:     M6 x 25mm bolt which fits through the central hole in the barrel, through the matching hole in the main body, and engages a nut in the knob.

Qty. 1:     M6 nut to be inserted into the knob.