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Ultimaker 2+ Connect severe Pause and Resume bug!!
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· Ultimaker 2+ Connect severe Pause and Resume bug!!
I believe this is due to what’s known as “buffer overrun” I’ve seen it on my own UM2+C as well as my UM2+ when printing over USB via OctoPrint. After a pause on my UM2+C, if the printer starts on an arc or circle, it begins to stutter, which you described as “stitching”. This is because arcs and circles are made up a bunch of linear moves and the printer runs out of buffer basically and results in the slow performance. This is also common when printing over USB because the serial connection has limited bandwidth. There's a Cura plugin designed to solve this called "ArcWelder" which combines these many linear moves into a single arc move which reduces the likelihood of a buffer overrun. But I'm not sure if this would be compatible with newer Ultimakers since they use a different flavor of g-code. The UM2+C also may not recognize the arc command, I know it recognizes a limited number of Marlin commands, hence why you have your workaround for pausing a print, since it doesn't recognize an M0
command.
What’s interesting is the latest version of FW for the Connect was supposed to address the buffering issue but my up to date machine still exhibits the “stuttering” after a pause.
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dfrez 21
I believe this is due to what’s known as “buffer overrun” I’ve seen it on my own UM2+C as well as my UM2+ when printing over USB via OctoPrint. After a pause on my UM2+C, if the printer starts on an arc or circle, it begins to stutter, which you described as “stitching”. This is because arcs and circles are made up a bunch of linear moves and the printer runs out of buffer basically and results in the slow performance. This is also common when printing over USB because the serial connection has limited bandwidth. There's a Cura plugin designed to solve this called "ArcWelder" which combines these many linear moves into a single arc move which reduces the likelihood of a buffer overrun. But I'm not sure if this would be compatible with newer Ultimakers since they use a different flavor of g-code. The UM2+C also may not recognize the arc command, I know it recognizes a limited number of Marlin commands, hence why you have your workaround for pausing a print, since it doesn't recognize an M0
command.
What’s interesting is the latest version of FW for the Connect was supposed to address the buffering issue but my up to date machine still exhibits the “stuttering” after a pause.
Firmware Release Notes
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kupfeli 9
Thanks for your detailed reply! I hope that Ultimaker will solve this problem.
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