<p>I have a Prusa i3 printer with mk8 extruder. I am using PETG with (200-240/75-85) degrees recommended temp on it's box. but when I do printing i hear some knocking sound that means there is a problem in extrusion. last time I did increase my temp up to 270 degrees!! maybe this sound solved! but it damaged my extruder's screw's inner Teflon and I forced to change it! </p>

<p>Now I have a new nozzle and extruder's screw, but again I can hear this sound during the printing! I thought maybe it's because of very close distance between the nozzle and the bed, but when I increase the distance, the filament starts to warping!</p>

<p>My nozzle is new and it can't be for clogging. so I decreased the print speed from it's default 60mm(in Cura software) to 50, but didn't solve this sound. Also when I use pronterface and do extrusion manually, it works nice with 200 degrees! but I can hear the sound in 190 degrees. But when I do printing I hear the sound even in 200 degrees! Is this mean I must increase the temperature for printing? how much?</p>

<p>By knocking sound I mean the sound you can hear when you have a clogged nozzle and the extruder's stepper motor can't push the filament into it and rotates with knocking sound!</p>

[{'answer_id': 4962, 'author': 'ZuOverture', 'author_id': 8847, 'author_profile': 'https://3dprinting.stackexchange.com/users/8847', 'pm_score': 2, 'selected': False, 'text': '<p>This is part of <a href="http://3dprinting-blog.com/tag/3d-printer-upgrade/" rel="nofollow noreferrer">filament drive</a>. Anets do not sell it separately, only as a part of extruder assembly, but other manufacturers may make incompatible parts: of different size (not fitting into bracket), filament channel position, etc.</p>\n'}, {'answer_id': 4963, 'author': 'Kaleb Iahn Reginaldo', 'author_id': 9023, 'author_profile': 'https://3dprinting.stackexchange.com/users/9023', 'pm_score': -1, 'selected': False, 'text': '<p>Like @ZuOverture said the name of this component is the filament drive. Most of the manufactures sell the whole extrusion device already assembled, to avoid mismatches between the components of the extrusion device. If your device is somehow damaged, and without possibilities to be used in the printer the easiest solution would be to buy a new extrusion device. If financially is unfeasible for you, you may have the option to generate the 3D model of this piece and share the file to someone who could print this component for you. </p>\n'}, {'answer_id': 4964, 'author': 'Fernando Baltazar', 'author_id': 4454, 'author_profile': 'https://3dprinting.stackexchange.com/users/4454', 'pm_score': 3, 'selected': False, 'text': '<p>This is the throat block for direct drive extrusion, Anet8 is a cheap clone of Prusa printers, so it\'s easy to find parts for Anet printers. </p>\n\n<p>This is one extruder kit that may help your needs, <a href="https://es.aliexpress.com/store/product/1Set-3D-Printer-makerbot-MK8-Extruder-Aluminum-extrusion-Frame-Block-DIY-Kit-for-Reprap-i3/1962255_32715673423.html?spm=a219c.search0104.3.269.W5yIqd&amp;ws_ab_test=searchweb0_0,searchweb201602_2_10152_10065_10151_10344_10068_10345_10342_10343_10173_10340_10341_10541_10562_10084_10083_10307_10060_10155_5680016_10154_10056_10055_10539_10537_10312_10059_10313_10314_10534_10533_100031_10103_10073_10102_10557_10142_10107,searchweb201603_25,ppcSwitch_5&amp;btsid=79693e48-00b7-4029-908d-314b37935569&amp;algo_expid=64c2aa2b-e9de-4722-8ecb-0ba5542f5a86-34&amp;algo_pvid=64c2aa2b-e9de-4722-8ecb-0ba5542f5a86" rel="nofollow noreferrer">1 Unidades Impresora 3D makerbot MK8 Extrusora De extrusión de Aluminio Bloque de DIY Kit para Reprap i3</a>. This is a link for Aliexpress - of course there are other dealers.</p>\n'}]
['https://3dprinting.stackexchange.com/questions/4965', 'https://3dprinting.stackexchange.com', 'https://3dprinting.stackexchange.com/users/9013/']