Flex box with round corners

Source 32 lines

// Flex box: a box with round corners, its four sides one strip of
// plywood bent by living hinges. The bottom's tabs lock into slots along
// the strip, and the lid sits on top, kept in place by an insert glued
// under it. Bend the strip slowly; warm, slightly damp plywood bends best.
 
use <kerf/hinge>
 
/* [Box] */
// Outside width
width = 120; // [70:5:250]
// Outside depth
depth = 80; // [70:5:250]
// Outside height, lid included
height = 60; // [30:5:150]
// Outside corner radius
radius = 18; // [10:1:35]
// With a lid, or an open tray
lid = true;
 
/* [Material] */
// Sheet thickness; living hinges suit 3 mm plywood or thinner
$thickness = 3; // [1.5:0.5:4]
// Beam width
$kerf = 0.15; // [0:0.01:0.3]
// Distance between the hinge cuts: closer bends easier
spacing = 1.5; // [1:0.25:3]
 
/* [Hidden] */
$material = "plywood";
$fn = 64;
 
flex_box([width, depth, height], r = radius, lid = lid, spacing = spacing);