The nozzle is the cheapest part of the printer and at the same time the most common cause of a ruined print. Here\u2019s how to tell a clog from wear, how to do a cold pull following the official procedure, and when it\u2019s time to replace the nozzle.<\/p>\n
The symptoms are similar, but the fixes are different.<\/p>\n
Wear is almost always caused by abrasive materials: carbon-fibre or glass-fibre filaments, metal-filled ones and glow-in-the-dark ones. Such plastics can eat through a brass nozzle in a few spools.<\/p>\n
This is the main way to clear a clog without taking the hotend apart. Bambu Lab describes it like this (values are for PLA):<\/p>\n
Other materials need other temperatures \u2014 go by your filament\u2019s working range and your printer model\u2019s page on the manufacturer\u2019s wiki.<\/p>\n
Replace the nozzle if:<\/p>\n
Brass conducts heat better, so it gives more consistent extrusion and a slightly cleaner surface \u2014 it\u2019s the standard choice for PLA, PETG, ABS and TPU. Hardened steel is only needed for abrasive materials; because it conducts heat less well, print temperatures are usually raised by about 5\u201310 \u00b0C.<\/p>\n
The practical takeaway is simple: if you don\u2019t print composites, there\u2019s no point paying extra for steel. If you do, brass simply won\u2019t last to the end of the spool.<\/p>\n
Always run a printer calibration and check the nozzle\u2019s Z offset. Tighten the nozzle on a heated heater block \u2014 otherwise the joint won\u2019t seal and plastic will start leaking along the thread.<\/p>\n
What you may need:<\/strong> nozzles and hotends<\/a>, a set of cleaning needles<\/a>.<\/p>\n This article has been checked against the official Bambu Lab documentation. Procedures and temperatures may differ for a specific printer model \u2014 check your model\u2019s page on the manufacturer\u2019s wiki.<\/p>\n<\/div>\nSources<\/h3>\n
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