19 minutes ago, CarloK said:
This file is not intended for modifications by users and therefor lacks any error checks.
Guess so. And i did not care for the fundamental Linux-Rule: make a copy first, then fill in your typos 🙂
Still, i'm a little puzzled, because the bondtech-value of 311 produces visible underextrusion. And it was not that easy to figure out how to extrude 100mm. Yes, this stuff is not intended to be managed by the user and I'm very glad, the Ultimaker-Machines are really Plug-and-Print.
My guess is that at your first change to the um3.json file you made a typing error. This file is not intended for modifications by users and therefor lacks any error checks. Any small error in the json file will create big problems. Hence the advice to always first make a copy of the file before you modify it.
Without a backup copy of the json file the only way to fix this is by updating the firmware, either through the network or from USB.
Glad to hear you were able to fix it yourself.
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