Alternatively, can't you take a usb cable and cut the power wires?
@anon: thank you 
it's an UMO! Are you sure about it? According to http://wiki.ultimaker.com/Electronics_build_guide there is one, somewhere...
"Starting from the 1.5.6 electronics, the electronics can be powered stand-alone. This may cause the fan and other electronics to run from your USB port. If you don't want this, you can 'open' the following jumper:"
@avi: i also thought about that way, but i would prefer another solution 
I think that page is incorrect. As far as I know, USB power goes directly to the Arduino's USB port. If there is a jumper to disconnect it, it would be on the Arduino. As far as I know, there is no such jumper on the Arduino.
Hmmm, very interesting. I checked the Mega's schematic and board files and there is a bridge that can be cut that disconnects the USB GND from the power GND.
This MAY, REPEAT MAY prevent the Mega from running on USB power. CUT THIS AT YOUR OWN RISK.
I think the worse case is that USB comm stops working but you should be able to reverse it with a blob of solder.
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I think they meant the ARD_PWR jumper, but if you remove it the whole arduino board is no longer supplied with voltage from the power supply. You cannot print without the USB cable connected then?!
Anyway, I found another solution here (where you also replied). I guess i found a more elegant solution to this problem:
https://ultimaker.com/en/community/view/6131-disabling-usb-power-because-my-memory-is-crap
Edited by Guest
@anon4321: I tried what you suggested but since UGND and GND are connected internally (in the ATMEL) GND is still available on the board. I will desolder the MOSFET FDN340P
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anon4321 16
UMO or UM2? There is no such jumper for the UMO but you can unsolder/solder some things on the Arduino to disconnect the USB power so it doesn't power the electronics when the USB is plugged in.
http://ultimaker.ipbhost.com/uploads/gallery/album_699/gallery_33216_699_3303656.jpg
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