<p>Yesterday evening i have been trying to print a few upgrades but after coming home after an hour, it is printing in the air because there is to much filament dust inside the extruder. Is this because the filament that is being extruded is getting to soft so the gear grinds parts off? I never had this problem before. </p>

<p>Printer:</p>

<p>Anet A8. </p>

[{'answer_id': 5712, 'author': 'jeremiah harless', 'author_id': 10337, 'author_profile': 'https://3dprinting.stackexchange.com/users/10337', 'pm_score': 1, 'selected': False, 'text': '<p>If you are using Repetier the code to test the endstops is m119 I think. If your z stop is triggered, you may have to invert it in the config.h file. I had this same issue for days before i figured out the control board was reading the switch as normal close instead of normal open. Hope that helps!</p>\n'}, {'answer_id': 5714, 'author': 'PR90', 'author_id': 10340, 'author_profile': 'https://3dprinting.stackexchange.com/users/10340', 'pm_score': 0, 'selected': False, 'text': '<p>Try sending a motion command manually, such as G1 X20 Z10, to eliminate any bugginess from the software interface as a reason for the Z not moving properly when commanded to. Next you could check the park location in Pronterface, perhaps the extruder head is sitting there waiting for the next command.</p>\n'}]
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