Parameterized Angle Bracket

Brackets for joining wood or extrusions at various angles. A variety of sizes and angles are provided.

The FreeCAD v0.19 file is included and the parameters are set from the embedded spreadsheet. Changing a number automatically updates the shape.

Use large washers to spread the force onto the plastic for maximum strength. Use a dense and isotropic infill, e.g. 50% cubic.

I printed using ABS / ASA with 0.5mm nozzle and 0.3mm layers. The ABS needs good bed levelling and a wide 10mm brim to hold it to the bed during thermal warping.

Very shallow angles (>135deg) may need supports.

Finite-Element-Analysis
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The FreeCAD file works well as a test case for the [FreeCAD v0.19 FEM_Module](https://wiki.freecadweb.org/FEM_Module).

To prepare the analysis:
* Make the screw holes a bit bigger to help the meshing, e.g. 5mm radius
* Start the FEM module and click the "A" button to add an Analysis
* Select the last LinearPattern element of