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Posted (edited) · No printers connected

I’m trying to get my Ultimaker 3 to work with my equipment. The first day the Ultimaker app on Android showed progress of the print very well, after this day in the next days no connection was possible anymore. Same with iOS app. One succesfull day, other attempts show no connection. Cura connect same on the MacBook. After resetting the Cura settings on the machines I mostly get the printer to work. But often not an I have to use the usb stick. The software says I need to approve the request on the printer (validation) but on the printer nothing is said and mostly after a new setup of the printer WiFi it all works again. But I can’t create everyday a new printer name. I’m now already on 5, started at one.


- what am I doing wrong?

- what is that validation request Cura sends to the printer and how to respond? 

- how can I keep the connection? ( pc and printer go off during the night)

- is it impossible to view the printer at the same time in iOS , Android and Cura connect in safari on the MacBook? 

- how to switch from safari connect on the MacBook to android monitoring when leaving the house ( I used vpn to show status in Android on that one day that Ultimaker app worked well



Hope le you can help me as new by with the ultimaker3

Edited by FlorisM
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    • 2 weeks later...
    Posted · No printers connected

    Ten days after posting my question I have no reactions at all! What did I wrong? Wrong subject, wrong group, wrong wording, please advise?!I love the power of users, colleagues and friends and I really depended on it. 

    In the meantime after one week of frustration and trouble shooting I have managed to solve the issue myself. It runs perfect now.

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    Posted · No printers connected

    Hi @FlorisM,


    sorry that nobody answered your questions. You did nothing wrong - I guess not many people knew what to do in this case since stuff that works only sometimes is hard to debug and there are no definite guides for this case.


    For the sake of helping others with the same problem, would you be willing to share your solution to this problem?

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    Posted · No printers connected

    I realized finally that my router is able to transmit Wifi on both 2,4 and 5 GHz frequency with the same name of network and that most Apple and Android devices are well able to connect to both frequencies. When I changed the name of the 5 GHz WiFi Network into a different one, suddenly the printer can be monitored by both Cura on the MacBook as well as on the Android telephone. Print jobs can be stopped and paused without issues and printer is recognized when starting Cura. So simple, if you realize it. I expect that the Ultimaker printer is not able to connect to the 5 GHz network? 

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    Posted · No printers connected

    You did nothing wrong, but sometimes people go on holidays.

    Cura sends an auth request if your printer has old firmware. If you upgrade it, you will get to use cura connect (which also provides cool features like queueing on the printer). 

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    Posted · No printers connected
    33 minutes ago, nallath said:

    Cura sends an auth request if your printer has old firmware.


    In some (very?) rare occasions, Cura and the printer seem to miscommunicate which causes Cura to assume the firmware is too old to properly communicate and then do that auth request. I've had this happen on an S5 (once), which never had the firmware that required authentication.

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    Posted · No printers connected

    The authentication  part is still a puzzle to me, though not blocking anymore.  I have had the request about 10 times during my troubleshooting, especially when I restarted the WiFi setup. Only once I have seen that on the printer the question was visible that I needed to confirm the connection. In the other 9 cases the authorization was handled “automatically” without user interaction on the printer. As said, everything is working now and I haven’t had the request anymore. 

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