<p>My Y-axis on my Monoprice maker select running ramps 1.4 and Marlin makes a thud noise when moving every now and then.  I have noticed a 1 to 2 mm shift in the print when this occurs.  I tighten the belts and alas no joy.  I ordered new bearings which should be coming Monday.  I also tried slowing the print down and still get the same result.  Anyone have any ideas.</p>

[{'answer_id': 4938, 'author': 'Mick', 'author_id': 3953, 'author_profile': 'https://3dprinting.stackexchange.com/users/3953', 'pm_score': 2, 'selected': False, 'text': '<p>A thudding noise is usually a belt slipping through its end-restraints. A clicking noise is usually a stepper motor missing a step. Seized bearings could be the cause.</p>\n'}, {'answer_id': 4946, 'author': 'user2698080', 'author_id': 8923, 'author_profile': 'https://3dprinting.stackexchange.com/users/8923', 'pm_score': 3, 'selected': True, 'text': '<p>The issue was the X-axis top smooth rod came out.  this caused the extruder to bang around and shift on the Y-axis when it shifted forward. thank everyone for their help. </p>\n'}]
['https://3dprinting.stackexchange.com/questions/4935', 'https://3dprinting.stackexchange.com', 'https://3dprinting.stackexchange.com/users/8923/']