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Printing at temperatures higher than 260°C on a UM2+ with original FW?

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The original firmware has the maximum temperature limited at 260C and no easy way to work around that.

The 260C limit is there because at high temperatures the PTFE coupler degrades, the higher the temperature, the faster the degrading. A decoupler damaged like this can still look ok, but will possibly have a smaller opening causing extra friction and under extrusion.

Short story: no Ultimaker support for higher temperatures than 260C.

Workarounds: Use one of the available alternative firmwares, or compile your own firmware version based on the open source Ultimaker code. The firmware and a description can be found here: https://github.com/Ultimaker/UM2.1-Firmware

The change to be made to the source files is in the file configuration.h, line 166. There you change the maximum defined temperature value from 275C to whatever you want (note that the value defined here is 15C higher because of a safety margin).

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Thank you for an very informative post! Much appreciated.


I’ve bought an 3rd party PTFE coupler (or something similar) that claims to withstand 295C. So far it has proven to work.


I guess I’ll give it a shot and compile my own firmware, if it’s really as “simple” as downloading firmware from github, edit line 166 and upload it back to my beloved printer I think I will manage ?


I don’t know all the right terms for this, but is there only the firmware that can be upgraded? So if I compile my own firmware and then later on you guys at Ultimaker releases a new upgrade (the one that typically is made from Cura) my compiled one will be overwritten?

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Yes, in the UM2 there is only 1 software package. So when you upload a new version from Cura it will overwrite your version.


That said, the UM2(+) has been around for a while and new updates become rare since most known bugs have been fixed. The last update was about a year ago, I think, and only in the upcoming Cura 3.5 release the next update is planned. If you want to be at that latest revision you would have to create your own new modified version again.

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