How to Unclog the Hot End - Clear the Nozzle How to Unclog the Hot End - Clear the Nozzle Clogged hot ends are unfortunately a normal part of 3d printing. Hot ends usually clog due to impurities in the filament. This guide will explain how to clear a clogged hot end. Written By: Printrbot Support © 2015 help.printrbot.com Page 1 of 4 How to Unclog the Hot End - Clear the Nozzle Step 1 — How to Unclog the Hot End - Clear the Nozzle Heat the hotend to 200 C. After the hotend reaches 200 C, let it stand for 3-5 minutes to ensure that the temperature has had time to stabilize. Although this guide is specifically using PLA filament as an example, some users prefer ABS for unclogging the hot end. If you wish to use ABS, heat the hot end to 240C instead of 200. Step 2 Load the extruder with PLA filament and attempt to extrude 5-10mm. It probably won't work, but that's okay, as we just want to "seat" the filament in the end of the nozzle. © 2015 help.printrbot.com Page 2 of 4 How to Unclog the Hot End - Clear the Nozzle Step 3 Change the temperature to 100 C. 160C if you are using ABS. When the temperature reaches 100 C, let stand for 3-5 minutes to ensure that the nozzle temperature has stabilized. Step 4 Hold the extruder body with one hand, and the filament with the other. Pull up on the filament firmly. After a little bit of give, the filament should come out of the extruder with a loud "pop". The filament might stretch 6-12 inches as you firmly and smoothly pull on it. Keep pulling until the filament pops out. It should bring out all of the filament, right down to the bottom of the hot end. Often when the filament pops out, you'll see a little cone at the end with a speck of dirt. That is usually the dirt in the brass nozzle. © 2015 help.printrbot.com Page 3 of 4 How to Unclog the Hot End - Clear the Nozzle Step 5 Bring the hot end to temp (apx 200-230C). Pull a bristle from a wire brush and use a pair of pliers to insert the wire into the nozzle of the hot end. This should dislodge the debris causing the clog. Now that the debris is loose, repeat steps 1-5 to clear the hot end. ADDITIONAL INFO: Bukobot has a great tutorial on nozzle cleaning, explaining the benefits of using nylon filament for the "cold pull". Go to http://bukobot.com/nozzle-cleaning for that article. Bear in mind that hot end tips are a consumable. Printrbot recommends changing tips every 3-6 months if you print regularly. Order a new hot end tip at printrbot.com. Go to printrbot.com/support for instructions on replacing the hot end tip. This document was last generated on 2015-04-30 07:18:17 PM. © 2015 help.printrbot.com Page 4 of 4
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