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Thanks for the suggestions. The tube is trimmed as short as it can go and still reach the corners. I found this https://www.teamfdm.com/files/file/601-bowden-tube-guide/ that looks like it would at least kick the tube to the other side so it can't get under the cable chain. I think I'm going to...
So, built a 350mm 2.4 and have been running it for several months with really good success. I did my first really big, tall print a couple days ago. It progressed beuatifully up to the last ~40mm in height. At that point, I believe that the PTFE tube feeding filament flopped under the gantry...
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