<p>I own a DIY Hypercube Evolution equipped with Tevo Titan extruder, Clone Chimera hotend and Capricorn's High-temp PTFE tube. I use RAMPS with Mega and A4988's.</p>

<p>During prints, my extruder motor randomly clicks. I touched the filament and during the clicks I'ven't felt any problems with extrusion. I looked at the motor shaft to control if it clicks at special angles or randomly, but it clicks randomly. My prints do look very good: clear and shiny.</p>

<p>Do you have any suggestions? (the sound really gives me headache)</p>

[{'answer_id': 6444, 'author': 'fred_dot_u', 'author_id': 854, 'author_profile': 'https://3dprinting.stackexchange.com/users/854', 'pm_score': 2, 'selected': False, 'text': "<p>Even though you may have acceptable extrusion, any clicking from that area of your printer is likely to be a missed step on the extruder motor. This may be insignificant with respect to print quality, but as you suggest, it is an irritation.</p>\n\n<p>If you are confident that your nozzle is clean of debris (which is likely), you could consider to raise the nozzle temperature a few degrees. If the nozzle is not applying enough heat to the filament, it may resist being forced through and a click representing a delay, allows that much more heat to be applied.</p>\n\n<p>You should not have to increase by much, certainly no more than five degrees.  It's also possible that you can slow the feed rate a bit to accomplish a similar result.</p>\n"}, {'answer_id': 6446, 'author': '0scar', 'author_id': 5740, 'author_profile': 'https://3dprinting.stackexchange.com/users/5740', 'pm_score': 2, 'selected': False, 'text': '<p>If an extra few degrees of heating the hot end does not work, you could try to increase the amount of Ampere through the steppers. Increasing the current will increase the torque of the stepper.</p>\n\n<p>The question is what your current  V<sub>ref</sub> of your extruder stepper driver is. To get a <a href="https://reprap.org/wiki/Pololu_stepper_driver_board" rel="nofollow noreferrer">maximum current</a> of 1 Ampere you require a V<sub>ref</sub> of 0.4 V if you have genuine Polulu A4988 stepper drivers with a 0.05 &#8486; (R<sub>s</sub>). Chinese drivers often have a different sensing resistor (R<sub>s</sub> = 0.1 &#8486;). With formula:</p>\n\n<p><code>Vref = I_TripMax * 8 * Rs</code></p>\n\n<p>You can then calculate the V<sub>ref</sub> to be 1 * 8 * 0.1 = 0.8 V.</p>\n'}, {'answer_id': 11804, 'author': 'cmm', 'author_id': 2082, 'author_profile': 'https://3dprinting.stackexchange.com/users/2082', 'pm_score': 2, 'selected': False, 'text': '<p>One thing or another limits (controls) the flow form the nozzle.  in ideal operating conditions, the molten/softened plastic is kept in a small pool in the nozzle, without high pressure, and responsive to pressure by flowing from the nozzle.  The plastic must be viscous and self-adhering enough that gravity and residual pressure on the melt will not be sufficient to draw the plastic out.</p>\n\n<p>If the plastic is too stiff, such as through not being at a high enough temperature, as the filament is fed by the extruder the pressure will increase until the pressure is high enough to force plastic from the nozzzle.  The plastic that is being fed by the extruder elastically compresses to generate the pressure.  Hooke\'s law in action.  This causes a delay at the beginning of extrusion, and a continuation of extrusion at the end.  The elastic "wind up" of the filament gives us the delay.  A printer in this mode will appear to work pretty well.  It may require higher "retraction" lengths to unload the pressure.</p>\n\n<p>If this is the operating mode, the filament outflow rate may be less than the rate at which filament is passing through the extruder.  Pressure continuallly increases until the extruder motor has insufficient torque, at which point it skips.  The pressure is not reduced very much by the skip, and plastic continues to flow, lowering the pressure until the extruder can again advance the filament.</p>\n\n<p>It might be worth increasing the temperature.</p>\n'}]
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