3D Printing Concepts Example Models
I’ve created these examples to help explain different properties of 3D printing to patrons at one of the libraries that I work. The idea is that each example explains itself, including a label.

Tolerance shows the ability for parts to fit together. Max size literally demonstrates the maximum size objects possible on a LulzBot Mini. Colors shows the colors my library currently has available. Infill shows how the LulzBot Cura slicer deals with shape interiors by default. The print was cancelled midway through to demonstrate. Over hang shows the ability to print self-supported overhangs. Bridging (heavily used) shows slight bowing when printing bridge shape structures. And supports shows how you can cancel that out. XYZ displays the standard names for axes as an attachment to the 3D printer (the print didn’t turn out the greatest, but it works as an example just fine). And poly compares low and high resolution (low vs. high polygon) models.

Download the CAD files for your own use:
tolerance, max size, colors, infill, over hang, bridging, supports, xyz, poly

Canada's dollar dips below 70 cents U.S. for first time since spring of 2003
The currency's historic low is 61.79 cents U.S. — set in January 2002

Canada’s dollar dipped below 70 cents U.S. on Tuesday for the first time in nearly 13 years.

The currency’s value fluctuates on a minute-by-minute basis but fell to as low as 69.89 cents U.S. before noon ET.

It was the first time the loonie was below 70 cents U.S. since the spring of 2003, according to Bank of Canada data.

The currency has been sinking for some time as a result of lower oil prices and other factors and fell below 71 cents U.S. for the first time in more than a decade last Wednesday.

The loonie is heavily influenced by the global price for oil, one of the country’s major exports.

Crude oil futures were trading just above US$30 a barrel, another multi-year low, as the loonie sank Tuesday morning.

The currency’s historic low is 61.79 cents U.S. — set in January 2002 — but it hit an all-time high of 110.3 cents U.S. in November 2007 as Canada’s resource-heavy economy benefited from global demand for its exports.

The last time Canada’s dollar was worth more than the greenback was about three years ago, in February 2013.