This is a thin wall test with both rounded and sharp corners. My slicer says it takes about 0.29m of filament, so it's a cheap test for adhesion, elephant-foot, speed, retraction, cornering, dimensions, thin-wall extrusion, and quality.

You can set the wall thickness to be your nozzle's ideal extrusion width. These three stls have different wall thicknesses:

I printed the pictured rough white part back in 2012 on a home-built Wallace with my own version of a Wildseyed MIG Welder Tip hot end, and wanted to redo the test on my new printer, but didn't have the pattern. So I hacked up the green one based on https://github.com/Irev-Dev/Round-Anything :

``` // thinwall_20_30 -- thin wall test piece, copied from memory // Uses polyround from https://github.com/Irev-Dev/Round-Anything

// https://www.thingiverse.com/thing:6216210

// Wall thickness thick = 0.5; // 0.01 // length x = 30; // width y = 20; // height z = 10;

// corner factor -- try 0 to sharpen the corners c_scale = 1; //0.1 // corner add -- try 3 to add 3 to the radiuses of the corners c_offset = 0; //0.1

$fa = .01; // facet angle $fs = $preview ? 5 : 1; // facet size $fn= $preview ? 32 : 64; // facet number

thinwall_rounded();

// x,y,radius radiiPoints=[ [0, 0, 0 * c_scale + c_offset ], [x, 0, 10 * c_scale + c_offset], [x, y, 10 * c_scale + c_offset], [0, y, 5 * c_scale + c_offset ] ];

use