Uncap the speedĪs you can see, most of the speed settings between profiles are quite similar in Bambu Studio, and the main speed limitation used is the Maximum Volumetric Speed set under the Filament Settings. All that, while also ensuring a consistent and smooth movement during printing for a uniform finish.Ĭhanges in the flow rate and print speed during printing can lead you in believing the printer has a Z banding or an extrusion problem, where in reality, the issue might not be related to the motion system and it’s actually related to the slicer settings used for the printed model.Īfter reading this article and following the suggestions, you should be able to easily get prints like this. The focus is to find a flow rate that works best according to the specific speed and layer height used, while also finding the “sweet spot” where the filament is not overheated to allow for a higher flow rate. This brings us to the problem we’re trying to resolve in this article: fine-tuning the generic filament profiles based on the needs of specific filaments made by other manufacturers. Usually, the value is pretty conservative but provides decent results with lower print speeds. To workaround that problem, Bambu Lab has set the “Generic” filament profiles in the slicer to a much lower Maximum Volumetric Speed to ensure that flow is consistent with a wide range of filaments without needing specific calibration. I had this issue with some specific PETG filaments and also with a bad batch of PLA. Of course, this depends a lot on the filament type and you can sometimes be limited to about 14-16mm^3/s if the filament used is not made for high-flow/fast printing applications. In my testing, the hotend can usually reach about 20-22mm^3/s for reliable prints, with a slightly increased print temperature. Those profiles usually work great and they’re very fast, but it’s not always possible to use them with filaments from other manufacturers and get perfect results, if the filament does not have a high flow rate.īambu Lab advertises their hotend to be capable of up to 32mm^3/s but that’s with specific higher flow filaments and conditions. Even the visual method will enable you to have perfectly fitting parts with smooth & flat top layers.Bambu Studio comes with a lot of pre-tuned filament profiles made for Bambu filament. The choice of the method depends entirely on your preferences in the end, both yield similar results. Visual Method - an easy method based on observing the visual properties of your models.Precise Method - using precision tools such as calipers or micrometers.There are two methods you can use to calibrate the Extrusion Multiplier, and we'll cover both of them in this article: Again, the usual values can range between 90 and 110, although that does not mean you can't go above or below that. In the printer menu, during a print, go to the Tune menu and then choose Flow. Usually, the adjusted values can be between 0.9 and 1.1. The default setting (for PLA) is 1, this value represents a percentage, 1 = 100%, 0.95 = 95% etc. In PrusaSlicer, navigate to Filament Settings and look for Extrusion Multiplier. If the top layer is over extruded, you'll end up with an uneven surface that will prevent a seamless connection between the two pieces. It's especially problematic when you're trying to glue two parts of the model. Overextrusion is a common problem with many filament brands. It causes small gaps that appear between layer lines or perimeters. Minor under extrusion - Not enough material is extruded (flow is too low).It causes scarring of bottom layers and unnecessary material buildup on top layers. Overextrusion - Too much material is extruded (flow is too high).This calibration is used to fix two common problems: For those interested in diving deeper, PrusaSlicer uses the same Flow math as Slic3r. Total flow rate = Flow multiplier in firmware (M221) x Extrusion multiplier in PrusaSlicer.
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