Merge pull request #423 from Achllle/body_plates

Body plates rev 4 + add gobilda discount

README.md

@@ -132,11 +132,11 @@ In our experience, this project takes no less than 100 person-hours to build, an
 
 The [Parts List Readme](parts_list/README.md) contains all the parts necessary to build the entirety of the robot as it is listed in our documentation.
 
+Note that educational builders may apply for a 15% discount at GoBilda by filling out [this form](https://form.123formbuilder.com/6143945/open-source-rover-edu-form). Make sure you do this on time as processing times may vary. 
+
 You can select higher RPM motors (to drive your rover faster) at the sacrifice of max stall torque. A selection of motors that would integrate easily with the rest of the suggested rover design can be found at [GoBilda - 5203 series](https://www.gobilda.com/yellow-jacket-planetary-gear-motors/).
 The rover design and the software can accommodate different wheel sizes if you find wheels you like better.
 
-The body plates that attach to all sides of the body are designed to be made from laser cut acrylic, MDF, hardwood, or similar. The 2D cutout files  are the .DXF files in the [laser cut parts folder](mechanical/body/dxf). They were designed to be around 3mm thick (1/8"). You can choose a material and cut them at your local makerspace's laser cutter or order them from an online service like [Sculpteo](https://www.sculpteo.com) or [SendCutSend](https://sendcutsend.com/).
-
 ## Additional Projects
 
 Take a look at these alternative Mars rover replicas:

mechanical/body/laser_cut_parts/README.md

@@ -0,0 +1,31 @@
+# Laser cut parts
+
+Contains the files required to cut the body plates.
+
+> **Note**: The side plates and 'gap slats' are identical and so only one file is included. Make sure you include **two side plates and two gap slats** when you get it laser cut!
+
+## Ordering
+
+Various companies will allow you to order laser cut parts with them with fast turnaround times. Some options:
+
+* [SendCutSend](https://sendcutsend.com/)
+* [Sculpteo](https://www.sculpteo.com)
+
+Formats provided:
+
+* 2D: DXF and SVG
+* Engrave: PDF
+
+You are free to pick different materials and colors. Using SendCutSend, your cart should look something like this:
+
+![sencutsend cart](osr_sendcutsend_cart.png)
+
+## Optional: Engrave the mission patch
+
+Front plates with the Rover patch logo as an engraving have been included as PDF files. There are two versions. The 'Opaque' version requires that the logo be engraved on the top surface of the material. The 'Clear' version allows the engraving to be on the bottom side so the top surface is smooth. 
+
+## Changelog
+
+* Use 22mm standoffs.
+* All holes have been made slightly larger to better accomodate the M3 screws. The size of the switch hole on the rear plate is also slightly larger. 
+* Some of the holes on the side and bottom plates have been moved to simplify assembly.