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Here is the quality from those types of printers. This is a professional grade printer. Cost a fee thousand I won't say what brand but this is what you can expect from FDM. The layers never fully bond 100% like with a SLA. You just get a light surface bond.
I'll try and get a video under one of the microscopes of it separating. It looks just like when you have the ribbon wires and you split a wire off from the rest. Slightly more force is required but I have split some wire that was about the same force as this.
Now you get a draft or a temperature drift and have one weak layer then combine that with thermal cycles that weak point can fail and it could be anywhere. So might end up with a small little string that you won't ever know. Or you might end up with 1/2 the plug inside your engine.
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