added profiles

stl/Calibration_cross/LICENSE.txt

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+Calibration cross (https://www.thingiverse.com/thing:2484766) by lukeskymuh is licensed under the Creative Commons - Attribution license.
+http://creativecommons.org/licenses/by/3.0/
+

stl/Calibration_cross/README.md

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+                   .:                     :,                                          
+,:::::::: ::`      :::                   :::                                          
+,:::::::: ::`      :::                   :::                                          
+.,,:::,,, ::`.:,   ... .. .:,     .:. ..`... ..`   ..   .:,    .. ::  .::,     .:,`   
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+   ,::    :::::::: ::, :::::::: ::::::::.,:: :::  ::: :::,:::, ::::: ::::::, :::::::: 
+   ,::    :::  ::: ::, :::  :::`::.  :::.,::  ::,`::`:::   ::: :::  `::,`   :::   ::: 
+   ,::    ::.  ::: ::, ::`  :::.::    ::.,::  :::::: ::::::::: ::`   :::::: ::::::::: 
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+   ,::    ::.  ::: ::, ::`  :::  :::::::`,::    ::.    :::::`  ::`   ::::::   :::::.  
+                                ::,  ,::                               ``             
+                                ::::::::                                              
+                                 ::::::                                               
+                                  `,,`
+
+
+https://www.thingiverse.com/thing:2484766
+Calibration cross by lukeskymuh is licensed under the Creative Commons - Attribution license.
+http://creativecommons.org/licenses/by/3.0/
+
+# Summary
+
+This is is the upgraded and version of the "Accurate calibration/dimension test". The upgrade has following changes:
+  - x and y are combined into one print
+  - over and under extrusion is evaluated
+  - the method has slightly changed but the principle is the same.
+
+This test jig is designed to analyse the dimensional accuracy of a printer using engineering methods. But don't be afraid: an excel sheet is included which performs all the math. You just have to print, measure and type in the numbers. A caliper is needed.
+
+Note that calibration is normally not needed for modern printers and calibration cubes are very coarse. Check: https://www.youtube.com/watch?v=Mbn1ckR86Z8
+
+Why this is more accurate than other calibration/testing methods:
+
+  - The edges have chamfers to eliminate effects from the first and last layers.
+  - Corners are rounded to minimize effects caused by sudden direction change.
+  - Different than a calibration cube the excel sheet does analyze the diffence in the length of the colums instead of their total lenght. This reduces the influence some effects wich would distort the calibration like a effective thicker wall due to z-wobble or over extrusion.
+  - It uses the total length availiable for typical calipers (150mm), reducing the influence of random efects
+
+A derived recomendation for design tolerances is included based using a typical engineering approach (3sigma).
+
+The excel sheet is protected against unintended changes but there is no password. So you can easily deativate the protection to edit the formulas if needed.
+
+In order to get some statistical data: If you have performed this test if you could post the standard deviation for X and Y, the printer and slicer used in the comment section. Thanks in advance.

stl/Calibration_cross/SOURCES.txt

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+Sources for Calibration cross
+
+Accurate calibration/dimension test (https://www.thingiverse.com/thing:2283998)

stl/Calibration_cross/attribution_card.html

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+<!-- from http://www.thingiverse.com/thing:8174 by whosawhatsis, used with permission -->
+<style type="text/css">
+#tagback {padding: 50px;background: white;}
+.tag {position: relative;border: 1px solid #eeeeee;width: 450px;height: 150px;margin: 0px;padding: 10px 10px 10px 120px;}
+.tag .qrcode-sidebar {float: right;margin: 0px;padding: 0px;}
+.tag a {color: black;text-decoration: none;}
+.tag h1 {font: bold 18px Arial,sans-serif;margin: 0px;padding: 0px; word-wrap: break-word; max-height: 2.25em; overflow: hidden;}
+.tag h2 {font: 14px Arial,sans-serif;margin: 0px;padding: 0px;}
+.tag h3 {font: 12px Courier,monospace;margin: 0px;padding: 0px;}
+.tag h4 {font: 9px Arial,sans-serif;position: absolute;bottom: 0px;left: 0px;margin: 0px 150px 0px 0px;padding: 0px;}
+.tag h4 div {float: left;margin: 0px 5px 15px 125px;height: 40px;}
+.tag h4 div img {height: 40px;}
+</style>
+
+<div id="tagback"><div class="tag">
+        <div class="qrcode-sidebar">
+            <img src="//chart.apis.google.com/chart?chs=150x150&cht=qr&chl=thingiverse.com/thing:2484766&choe=UTF-8&chld=Q|1">
+        </div>
+        <h1>Calibration cross by lukeskymuh</h1>
+        <h2>Published on August 15, 2017</h2>
+        <h3>www.thingiverse.com/thing:2484766</h3>
+        <h4>
+                                                                                                            <div class="row-fluid cc-licenses">
+                                            <span class="span6">
+                            <img src="//www.thingiverse.com/img/cc/chooser_cc.png" />
+                        </span>
+                                            <span class="span6">
+                            <img src="//www.thingiverse.com/img/cc/chooser_by.png" />
+                        </span>
+                                    </div>
+                    Creative Commons - Attribution<br /></h4>
+</div></div>
+
+<script>
+// TODO
+window.onload = function(){
+    document.getElementById('tagback').appendChild(document.getElementById('tagback').firstChild.cloneNode(true));
+};
+</script>