Added 3D printed case

case/readme.MD

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+### These models are for the PocketTRS version 2.3b board.
+
+![PocketTRS Case top view](IMG_1893.jpg)
+
+##### Instructions:
+
+The case print is a single model (PocketTRS v2.3b case bottom version 1). It uses M3x4 screws to secure the board.
+
+The lid is printed using three models to get the logo inlays.
+
+Print First - Lid Silver Text inlay
+Print Second - Lid Black inlay
+Print Third - Lid Main
+
+<i>Please note that if you intend to use the logo for commercial purposes
+the fonts are proprietary and you will need to purchase the font for the "POCKET TRS" lettering.  The font is Microsquare Bold Extended.</i>
+
+To print the lid, download all three lid models. Align them in your slicer and then slice the models individual. In Cura, I deleted two of the models and then sliced each. Using Ctl-Z to undo the delete is the easiest way to get the three g-code files.
+
+You will need to use a <b>z-hop</b> for the layers to avoid the head crashing into previously printed parts. I set it for .5mm and that seems to work fine. Z-hop plugin is available in the Cura marketplace.  
+
+Also, if you have an ABL installed (BL-Touch, CR-Touch, etc) you need to offset the print from the bed center so the autolevel doesn't callibrate on top of the printed models.
+
+Print the silver inlay text first, then the black inlay and finally the silver lid (or whatever color combo you prefer).
+
+The lid is designed to snap onto the case. It's not a super tight fit, so feel free to make adjustments in the design.