Summary

Here is my inexpensive way to get an Micro SD slot connected to the Ultimaker. The UltiController would cost me close to $200 including shipping to get. Plus, I don't really need the display screen that comes with it.

Instructions

I got this board on ebay: http://www.ebay.com/itm/260974675033?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649#ht_1002wt_714

The side of Micro SD board with the slot has the pins labelled. However, there are names and extra pins like DO, D1, D2, CD etc. that wasn't matching with the names for the pins on EXP2 on the Ultimaker board: http://www.reprap.org/wiki/Ultimaker%27s_v1.5.3_PCB

Looking on the other side of the Micro SD board that has "WAVESHARE" shows labels to the pins closely matching to the EXP2 on the UM board. I use only those pins to connect to the UM board EXP2. The other pins are not even labelled on this side of the board and are not used.

Here are the connections. Again, look at the "WaveShare" side of the Micro SD board:

Micro SD pins ---> EXP2 UM pins

     3.3V  ---> 3.3V      GND  ---> GND MISO(DO)  ---> MISO MOSI(DI)  ---> MOSI     SCLK  ---> SCK       CS  ---> SS

The ribbon cable is a grey 10 wire IDC cable pressed connected to an IDC female plug. Assembly of the plug/wire is on Makerbot support. The other end of the cable is soldered to individual female plugs. I got the female plugs at Fry's Electronics and I don't see them in stock anymore. This is a work in progress because I haven't printed anything from this card yet. So far I am able to see gcode files from the small 4GB card in Printrun. If your computer doesn't have a Micro SD slot then an Adapter card like the one on the right is needed to insert to a regular size SD slot. The blank.txt file was just added to meet the requirement of having something that was not an image uploaded.

Micro SD board for Ultimaker