“Christine Evans is the Director of Product Marketing & Content Strategy at Fictiv, an on-demand manufacturing company. So, ignoring this small check may cause a lot of issues going forward. This is because every filament has a different composition, and the density is also not always the same. This avoids the nozzle getting clogged and thus eliminates the over or under extrusion problems, which are the most important issues concerning flow rate.Īfter every filament change, the flow rate should be studied and modified if needed. Alternatively, if you are using a 3mm filament, then the recommended nozzle size is greater than 0.4mm in diameter. If you are using a 1.75mm filament, then the recommended nozzle size is less than 0.4mm in diameter. This will lessen the pain of frequently adjusting the flow rate settings. So, by staying within the ideal size range flow rate, issues can be reduced. Not all filaments can work with all nozzles. (For example, if you have 1mm between the mark and the extruder on a 60mm extrusion, you’d calculate (60-1)/(60) or 98.33% extrusion aka 1.67% under extrusion – a perfectly reasonable amount.)Īdjust the Diameter of the Filament and NozzleĪs a general rule of thumb, you should always try to find the ideal combination of filament and nozzle diameter. Then, subtract the amount left from the expected amount and divide that by the expected amount of extruded filament and you’ll have the amount of actual extrusion. It’s best to test your maximum flow rate by marking your filament at 60-100mm from the extruder, pushing the same amount of filament through the system, and writing down the distance between your mark and the extruder extrance. However, I found that some (especially Creality ones with cheap extruder gears) won’t skip until the system is underextruding to nearly 60% of the expected extrusion volume. In our reviews we originally tested maximum flow rate as the point where the extruder started skipping. This causes increased backpressure and friction, eventually leading to your extruder skipping steps. This happens if you’re trying to push too much filament through the nozzle than your nozzle can melt. In a bit of a backwards twist, increasing the flow rate too high will result in underextrusion. Nozzle clogging is a common problem associated with high flow rates and can be addressed by slightly lowering the flow rate or properly calculating your volumetric flow rate. If your nozzle clogs frequently, you likely have too high of flow rate compared to the mechanical limitations of your printer. The following are some of the major issues this can cause. When these problems occur, it is most likely due to the wrong flow rate. How to Identify Flow Rate Issuesįlow rate issues always tend to cause two major problems: over extrusion and under extrusion. However, a low flow rate can cause under extrusion as well as gaps in the print. Low Flow RateĪ low flow rate is desirable when you have a larger-diameter filament and want to reduce the flow to ensure all intricate details are captured by the print. The disadvantages are that a high flow rate also increases the chances of oozing, stringing, under extrusion, extruder skipping, and it can result in nozzle clogging. The higher the flow rate, the faster the print. The advantage of a high flow rate is that it increases the speed of 3D printing. If the multiplier is set to 0.8 or 80%, the flow rate will be reduced by 20%. So, if a user adjusts the multiplier to 1.2 or 120%, the flow rate will increase by 20%. By default, the multiplier is set to 1 or 100%. In slicing software, the flow rate is also called an extrusion multiplier. All these factors combine to rule the 3D printer flow rate. This also depends on the diameter of the filament and the diameter of the nozzle. This value is automatically calculated by the 3D printer and depends on the steps per millimeter (steps/mm) that the extruder stepper motor takes. The flow of a 3D printer is the volume of filament passing through the extruder.
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