umo mod: total shutdown (no more USB power)

you switch off your UMO and the display/fan ist still running? you are bugged from that? here is a solution

3D printer parts and enhancements

Creative Commons Attribution Share Alike

Commercial use is allowed, you must attribute the creator, you may remix this work and the remixed work should be made available under this license.

Learn more or download attribution tags


There are a lot of ways to solve the problem that if the USB cable is plugged in, the display is on and fan is running.

One solution ist the following:

Remove the ARD_PWR jumper near the electronics fan socket.
The downside is: You cannot run your Ultimaker without an USB cable anymore (even if you try to print from SDCARD) because the Arduino is no longer powered by the external power supply (but from the USB cable).

Another is described here:
It works! But you have to desolder the polyfuse and solder a bridge. Looks like a mess in my eyes.

My solution is to simply desolder the MOSFET that is used as an switch to supply the USB voltage (+5V) to the arduino. You can see a picture above, just desolder the little device with the three pins that was in the red circle. You can take a look at the other pictures to understand why that works ;)

In order to get access to this part, you have to remove the fan on the electronics and then disassemble the Ultimaker shield from the Arduino (just pull it off). Please be very very careful while desolding (you can easily damage your hardware). A good idea is to cover the electronics with capton-foil and cut a little hole for the MOSFET. You can easily desolder it with hot-air this way.

Materials and methods

soldering iron



    Issues are used to track todos, bugs or requests. To get started, you could create an issue.


    32bc3fb8880f7304ddcb3d26dee1d884?default=blank&size=40Llaskuci Llaskuci added this to the arduino collection ago
    A326efad8c7f78cd62a6f9288bc13059?default=blank&size=40coastroad added this to the UMO collection ago
    Mini proktorKostya added this to the Printer collection ago
    Bcbf3000397afde5dd1875cf5476e84b?default=blank&size=40wowowaa added this to the CTC Giant collection ago
    Mini lisca mangaLisca added this to the ultimaker up's collection ago
    Mini ataraxis glow bigataraxis published this design ago