Left wall (tshort#4)

* Add screw insert to hold the teensy

* Allow wider wall spacings for more internal room

* Fix the clunky thumb connections

* Enable the teensy holder for all styles

Author: tshort

.gitignore

@@ -5,5 +5,6 @@
 .nrepl-*
 
 .lein-*
-
+*.gcode
+*.scad
 /target