3DPrinting
3DPrinting is a place where makers of all skill levels and walks of life can learn about and discuss 3D printing and development of 3D printed parts and devices.
The r/functionalprint community is now located at: or !functionalprint@fedia.io
There are CAD communities available at: !cad@lemmy.world or !freecad@lemmy.ml
Rules
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No bigotry - including racism, sexism, ableism, homophobia, transphobia, or xenophobia. Code of Conduct.
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Be respectful, especially when disagreeing. Everyone should feel welcome here.
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No porn (NSFW prints are acceptable but must be marked NSFW)
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No Ads / Spamming / Guerrilla Marketing
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Do not create links to reddit
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If you see an issue please flag it
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No guns
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No injury gore posts
If you need an easy way to host pictures, https://catbox.moe/ may be an option. Be ethical about what you post and donate if you are able or use this a lot. It is just an individual hosting content, not a company. The image embedding syntax for Lemmy is 
Moderation policy: Light, mostly invisible
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I disagree with it being a first layer issue otherwise it would be failing much earlier not 80% of the way through the print. If the first layer being too thick were the issue, it would also be visible or colliding with every layer below this one too and those layers appear to be fine.
Do you have other filament to test with? That would help isolate the issue to either the filament or the printer. It could be the Z axis screws need lubrication especially if you notice this issue happening at around the same height.
How many hours are on your nozzle? Ive had to swap out my nozzle on my X1C after having similar issues and they went away. Even the hardened steel nozzles wear out and allow too much flow through them which leaves extra plastic on the print that can lead to collisions.