Added the Preparation and Cost section

guide/README.org

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+* Preparation and Cost
+   Get all the parts / raw material
+   - For the 3D printing there are two options:
+     1. Filament, which is the basis for 3D printing. Luckily I could print at my work-place
+        which reduced the cost from 210€ to 70€
+     2. Buy the printout of adareth's model at shapeways for 210€ over here
+        http://www.shapeways.com/designer/adereth/creations
+   - Decide on the switches
+     - If you are going to invest a whole lot of time and money for a custom keyboard instead of
+       buying one for 10€ I'd recommend to use your favorite switch-type. To make a
+       well-informed decision I bought a switch-tester for this from massdrop and decided on
+       Cherry MX Whites. https://www.massdrop.com/buy/varmilo-switch-tester-with-anodized-case
+     - I ordered 70 Cherry MX Whites from here:
+       https://mechanicalkeyboards.com/shop/index.php?l=product_detail&p=847
+   - Decide on the key caps
+     - On the glamour-Shot you can see the 1976 keycap set, it used to be sold over here:
+       http://pimpmykeyboard.com/sa-1976-keycap-set/ but the link is dead right now. You could
+       try this link: https://www.massdrop.com/buy/nineteenseventysix-sa-keycap-set but it is a
+       massdrop which is way different from usual online-stores. If you find a site that sells
+       these make sure you get the right amount and type of keys according to the layout
+     - I got the "TKL Base Set + TKL Modifier" from over here:
+       http://pimpmykeyboard.com/dsa-pbt-abs-blank-keycap-sets/ but I'm still too long keys
+       short, I will have to order those specifically and I have a bunch of keys I don't use
+       left-over.
+   - The USB-Cable that connects the keyboard to your computer
+     - It's an USB 2.0 to USB Mini-B cable, make sure you get one that is 2 meters long, it
+       really makes handling the keyboard so much more comfortable
+     - https://www.amazon.de/gp/product/B00NH11N5A/
+   - The main controller (right half)
+     - A Teensy 2.0, i got that one from here: https://www.pjrc.com/store/teensy.html
+   - The chip, connectors and cable to give life to the left half
+     - TTRS cable and jacks
+       - Got my TTRS cable from here: http://www.digikey.de/product-search/de?keywords=839-1257-ND
+       - Got my TTRS jacks from here: http://www.digikey.de/product-search/de?keywords=CP-43514-ND
+     - MCP23018 16 bitIO Expander
+       - Got mine from here: http://www.digikey.de/product-search/de?keywords=MCP23018-E%2FSP-ND
+
+   What I spend on my keyboard (should give you a rough estimate for your build):
+   | item                              | cost |
+   |-----------------------------------+------|
+   | filament                          |   70 |
+   | switch-tester                     |   30 |
+   | key-caps                          |   70 |
+   | teensy 2.0                        |   30 |
+   | switches                          |   60 |
+   | usb cable                         |   10 |
+   | IO Expander, TTRS jacks and cable |   30 |
+   |-----------------------------------+------|
+   | overall cost                      |  300 |
+   #+TBLFM: @9$2=vsum(@2$2..@8$2)
+
+   My choices / advantages:
+   - Using the soldering iron at the uni-workshop for free
+   - 76 Diodes for free
+   - Soldering wire and copper for free
+   - All the resistors used for free (5 resistors are used)
+   - Several files for working out the rough edges of the 3D-printout
+
+   Depending on what you have available you might spend more or less money than me, 300€ however
+   is a good rough estimate.
+
 * Dactyl Flexible PCB Rough Guide
 
 [[workbench.jpg]]