I recently got into 3d printing and purchased a TAZ 6. I have been doing a lot of research on how to determine the optimal Filament Extrusion Multiplier, Print Head Speed, and Extrusion Temperature for printing a particular filament. I am trying to find an efficient way to do this (so that I can spend the least amount of time and money generating this information for every new filament I use) and was wondering if I could get some input from you all.
I would like to base my discussion today on the following test results compiled by 3D MATTER, a startup located at New Lab in Brooklyn, NY. Please keep in mind that for their “Influence of Extrusion Temperature on Mechanical Performance” test, they did not test the layer bond strength which would be affected by Extrusion Temperature.
It seems to me that the first step is to dial in the Extrusion Multiplier so that there is no under extrusion and no over extrusion. The way to do this would be to set correctly (in hardware) the idler tension and (in software) the filament diameter and nozzle width then print (“slowly” so that the extruder gear will not skip and the filament will not slip and at an “acceptable” temperature so the filament can be properly extruded) stairs while varying Extrusion Multiplier for each stair level. The Extrusion Multiplier that provides the best stair face (that does not exhibit under extrusion or over extrusion) would be selected. This would be all that is needed. Am I correct ?
Next, I believe that Print Speed optimization should be performed. This would be done by printing (at an “acceptable” temperature so the filament can be properly extruded) “suitable” complex test objects at different Print Speeds and selecting the Print Speed that provides the most visually pleasing test object. This Print Speed would be the optimal Outer and Top Shell Print Speed. The optimal Bottom Shell Print Speed would be one as close as possible to the optimal Outer and Top Shell Print Speed but slow enough to not allow the print to detach from the print bed. Now how about optimal Inner Shell Print Speed and Infill Print Speed ? It would seem that these should be printed at the maximum speed that the print head can move UNLESS line bond strength lowers as speed increases and in that case, they should be printed at the maximum speed that provides acceptable line bond strength. Does print speed affect line bond strength ?
Lastly, Extrusion Temperature optimization should be performed. It would seem that the obvious thing to do to optimize Extrusion Temperature would be to print something (perhaps a single wall hollow cuboid with no top/bottom while varying temperature through the layers) and select an Extrusion Temperature based on the its print quality and layer bond strength. However this would only give you the optimal Extrusion Temperature at a given Extrusion Rate. For example, if through this method, I determined that the optimal Extrusion Temperature is 230C at w=0.5mm, h=0.2mm, optimal outer shell speed=20mm/s, then I only have the optimal Extrusion Temperature for an Extrusion Rate of 0.5x0.2x20=2mm^3/s. This means that I would need to do this optimization for every nozzle width and every layer height that I would like to print at creating a 2d map of optimized Extrusion Temperatures. Am I correct ?
Does this process seem like an efficient way to determine the optimal Filament Extrusion Multiplier, Print Speed, and Extrusion Temperature or have you all a even more efficient method ?
I really appreciate your time.