The Product Information or any part thereof may also not be regarded as a warranty of any kind. In no event the Product Information or parts hereof shall be regarded as guarantee of conditions or characteristics. Stepper accuracy can't be increased by increasing microstepping resolution. Most stepping motor manufacturers quote angular accuracy of ☐.9° or 1/400 revolutions. Most common stepper resolution is 200 full steps per revolution but when driven for example with 16-microstep drive, the resulting resolution is 1600 steps per revolution (1/1600 revolutions).īecause steppers don't usually have feedback devices, the accuracy depends on motor load torque and motor linearity. Most modern drives implement microstepping to increase resolution and motion smoothness. Stepping motor resolution depends on number of magnetic steps per revolution and drive's electrical step angle size. High resolution feedback are some times used to maximize motion smoothness at low speeds. If feedback device has very high resolution, such as 1/1000000, then limiting factor of accuracy will be other error sources than feedback device alone. 1000 PPR encoder can be expected to provide 1/400 to 1/800 revolutions accuracy. In ideal conditions the accuracy is very close to resolution but in most of practical cases the accuracy is 5 to 10 times less than resolution. Accuracy is more difficult to measure because it largely depends on mechanical load characteristics and dynamics. In most cases accuracy is more important value than resolution. 1000 PPR (pulses per revolution) quadrature encoder yields 1/4000 revolution resolution because 1000 PPR equals 4000 counts per revolution after standard 4X decoding. Servo motor resolution is determined by feedback device of motor. So I guess there's no real reason to do it after all, at least not in S3D.Servo motor Resolution Comparing the generated G-codes clearly shows that at 90% layer height, all E-axis moves are ~90% of what they were before.Ġ.2mm 100% first layer height: layer 1, Z = 0.200Ġ.2mm 90% first layer height: layer 1, Z = 0.180 However, being a skeptic I decided to test this in the latest S3D version (4.1.1) and this does not appear to be true at all. The increased thickness of the first layer can help absorb small defects in the build plate and provide more surface contact area, which will result in better first layer adhesion. Many machines benefit from 200 or 300% for the first layer height when the layer height is 0.05 mm or 0.1 mm. Using a First Layer Height well above 100% can be extremely helpful in these cases. For example, if you are printing at very fine layer heights, such as 0.05mm, a tiny variance in your bed leveling can result in poor first layer adhesion. In other cases, using a percentage above 100% is helpful. This reduction in height generates extra pressure and more surface area for that layer, which will help the first layer adhere to the print bed. Another way to think of this is that 100% of your extrusion will be forced into a space that is 75% of the layer height. For example, if you entered 75%, your first layer height is reduced while your extrusion remains at 100%. Percentages under 100% will reduce the height of the layer being printed (with no change to the extrusion amount). There are actually two ways to adjust the height and pressure: From a Simplif圓D article:Īdjustments to the First Layer Height allow you to vary the amount of pressure the filament exerts against the bed. The reason people use lower layer heights is that supposedly, this means you get 100% of the filament extruded into 90% of the space and are thus squishing the filament harder against the bed.Īlthough slicer behaviour may vary this notion isn't pulled out of thin air.
0 Comments
Leave a Reply. |