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How to Save Money When Buying Conductive ABS edge banding Manufacturer

Author: becky

Jun. 24, 2024

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Hotbed flatness, voodoo or scientific method?



Ignoring flatness for a moment, adhesion depends on the surface material of the bed, its temperature, the size and shape of the object, the material being printed, hot-end temperature, and environmental factors like temperature and air movement. You also have to consider mechanical issues in the printer- is it able to maintain a constant Z elevation throughout the range of motion of the X and Y axes? If the bed and extruder carriages move in arcs because the the end supported guide rails sag, you may to have a hard time getting prints to stick anywhere but near the center of the bed.

In the slicer you specify the first layer thickness, with a number like 80% of nozzle diameter being considered the maximum (in Cura, anyway). If your nozzle is 0.25 mm that means maximum first layer setting should be no more than 200 um. Obviously, a 200 um deviation from flatness is bad, but if the nozzle is less than 200um away from the bed the plastic will get squished out and it will work as long as the extruder doesn't jam. An extruder jam is going to be a function of the material and the hot end temperature. If the first layer is printed too close to the bed the excess plastic tends to make ridges. On the next layer, as the nozzle bangs into those ridges they may be knocked loose. So there are many variables on the "too close" side of the problem.

Going the other direction, if the nozzle is too high the plastic will appear to be under-extruded and there may be gaps between the lines laid down. This will affect how well the model sticks to the bed. Straight lines will tend to pull off the bed more than curves. Small objects will pull off easier than large ones. The shape of the nozzle may also have an effect- if the hole is smaller than the brass area at the tip, the nozzle may push on the previously laid down line and tend to either remelt or knock it loose. So there are many variables on the "too high" side as well.

So how much deviation from flat is acceptable? Your guess is as good as anyone's, but it is reasonable to say it should be less than +/- nozzle diameter.

All this assumes you've leveled the bed properly, meaning adjusting tilt so that the deviation from flatness measured at the nozzle tip is uniform, and that your printer can maintain that setting. The best thing to do is minimize the errors that are most easily controllable- start with a flat bed, minimize temperature variation over its surface by using a thermally conductive material (aluminum, anyone?), regulate the temperatures of the bed and nozzle using PID control, build a solid printer that's able to maintain the level setting throughout the range of motion of the X and Y axes, calibrate your extruder, and control air movement and ambient temperature by enclosing your printer (hey look, all that stuff that the $300 printer kit people took out!).

Edited 3 time(s). Last edit at 05/07/ 08:42AM by the_digital_dentist.

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The effect of the error has been experienced by everyone here- if the nozzle is too close, the extruder jams. If it's too high the part doesn't stick.Ignoring flatness for a moment, adhesion depends on the surface material of the bed, its temperature, the size and shape of the object, the material being printed, hot-end temperature, and environmental factors like temperature and air movement. You also have to consider mechanical issues in the printer- is it able to maintain a constant Z elevation throughout the range of motion of the X and Y axes? If the bed and extruder carriages move in arcs because the the end supported guide rails sag, you may to have a hard time getting prints to stick anywhere but near the center of the bed.In the slicer you specify the first layer thickness, with a number like 80% of nozzle diameter being considered the maximum (in Cura, anyway). If your nozzle is 0.25 mm that means maximum first layer setting should be no more than 200 um. Obviously, a 200 um deviation from flatness is bad, but if the nozzle is less than 200um away from the bed the plastic will get squished out and it will work as long as the extruder doesn't jam. An extruder jam is going to be a function of the material and the hot end temperature. If the first layer is printed too close to the bed the excess plastic tends to make ridges. On the next layer, as the nozzle bangs into those ridges they may be knocked loose. So there are many variables on the "too close" side of the problem.Going the other direction, if the nozzle is too high the plastic will appear to be under-extruded and there may be gaps between the lines laid down. This will affect how well the model sticks to the bed. Straight lines will tend to pull off the bed more than curves. Small objects will pull off easier than large ones. The shape of the nozzle may also have an effect- if the hole is smaller than the brass area at the tip, the nozzle may push on the previously laid down line and tend to either remelt or knock it loose. So there are many variables on the "too high" side as well.So how much deviation from flat is acceptable? Your guess is as good as anyone's, but it is reasonable to say it should be less than +/- nozzle diameter.All this assumes you've leveled the bed properly, meaning adjusting tilt so that the deviation from flatness measured at the nozzle tip is uniform, and that your printer can maintain that setting. The best thing to do is minimize the errors that are most easily controllable- start with a flat bed, minimize temperature variation over its surface by using a thermally conductive material (aluminum, anyone?), regulate the temperatures of the bed and nozzle using PID control, build a solid printer that's able to maintain the level setting throughout the range of motion of the X and Y axes, calibrate your extruder, and control air movement and ambient temperature by enclosing your printer (hey look, all that stuff that the $300 printer kit people took out!).

Contact us to discuss your requirements of Conductive ABS edge banding Manufacturer. Our experienced sales team can help you identify the options that best suit your needs.

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