update sketchup model

[clinton/wilson.git] / README.md

diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -2,20 +2,31 @@ wilson
 ======
 
 Reprap Wilson, 3D printer design
+Published under GPL v3
 
-This is my reprap printer design, shamelessly derived from ideas seen on several other printers, most notably the Prusa i3.  
+This is my reprap printer design, a derivative from Josef Prusa's i3 with the
+following goals:
 
-The main goals of Wilson are:
+1.  Replace the waterjet metal frame / wooden box frame with an inexpensive
+       and rigid frame made from standard 2020 Aluminum Extrusion.
 
-1. To eliminate the need for a costly waterjet frame, or a difficult to make lasercut wood frame, with no compromise to rigidity and ease of adjustment.
-2. To make the build volume parametric (easy to scale up or down by 50%).
-3. To simplify construction of the printer by reducing vitamins.
+2.  To make the build volume parametric (easy to scale up or down by 50%), with
+       a parametric BOM tool (spreedsheet) to assist in part selection.
+
+3.  To simplify construction of the printer by reducing vitamins and including 
+    detailed assembly steps as part of the design files.  I've made an effort 
+       to reduce the number of unique parts (nuts & bolts) as much as possible.
+       I've also incorporated single-piece Y ends that eliminate about 20 more
+       hardware items.
 
 The repository has these parts:
 
 1. The STL files needed to build the printer.
 2. Documentation section where instructions and parts-list can be found.
-3. Some parts have corresponding OpenSCAD models which are kept in the scad folder.
-4. Various images of the printer/build process are in the images folder.
+3. Some parts have corresponding OpenSCAD models which are kept in the scad 
+   folder.
+4. Various images of the printer/build process are in the images folder 
+   (beneath docs).
+