The unequivocal sign that the printer has vibrations that compromise the success of the prints is the presence of a plot. From barely perceptible to definitely visible, you can see it on the faces of the print (most frequently X and Y).
These vibrations are quite normal if you do not set the settings properly with acrylic printers, but they can also be a good wake-up call for metal printers that should be completely free from vibration, now we will see in more detail the measures that it is best to take in order to eliminate this phenomenon.
Vibrations: Print Speed
The first check to make is on the print speed. When printing too fast, sudden changes of direction, a 90° curve or backward movement carried out too quickly give a real blow to the printer frame. If this is not rigid enough, the force released turns into vibration and forms a “mark” on the face of the print that will be repeated. This happens again each time the printer does that particular manoeuvre.
The most obvious solution is to decrease the speed by a quarter at a time and check that the problem is alleviated and disappears.
If the problem persists after decreasing the print speed to 30/40 mm/s, then you will have to go on to analyze the speed and jerk values of the firmware. The Jerk values refer to the acceleration and deceleration of the motor of the given axis.
If you are aiming at speed think about of buying a delta printers. Some can print very fast! Tevo Little Monster can get to 350 mm/s very easy, producing quality prints!
Vibrations: Change JERK Values
If you are experiencing problems with vibration, we recommend using the values given. If you have the Marlin firmware, you can change the jerk values via keypad, or by entering the new values directly into the firmware. This will of course result in a complete flash readout.
Also the values of DEFAULT_MAX_ACCELERATION could be reduced to 2500/2000 to obtain a more “relaxed” print.
The key is to play a little with the settings to find the right one for our machine.
Vibrations: Mechanical problems
If, despite the corrections on speed and firmware, our creations still show signs of vibration, it is time to carefully inspect the frame of our printer. In search of some mechanical problem. As mentioned before, the vibrations can be the alarm bell that signals a likely loose screw, a veined arm, a part that does not flow as easily as it should.
We need to arm ourselves with great patience and thoroughly examine the printer. If possible during a print, and go back to the precise point that creates the vibration and carry out the repair/replacement.
It can be frustrating to go and look for the noise, the little vibration and not dedicate to the actual print the time we would like. But every experience we do makes us more prepared, and projects us towards the resolution of the same problem that could arise in the future. Never as in this case is the saying reflected: “learn the art and put it aside”!