![]() I would up the steps per mm 10 steps at a time until you see a change, hopefully an improvement, if you up it and it gets worse, or starts to fold layers, then it could be something else. I would expect this to be less on a dual sided gear extrusion.Īnother thing to thing about is that different feedstocks have different force pressures from gear teeth, so diameter of circle of teeth is different slightly depending on feedstock, are you using a really soft pla? how deep. the rest of the slippage is from stretching of the feedstock and various other small factors. There always is a small amount of slippage from feedstock, so this can be partially corrected by upping current to a point. what stands out to me is the different wall thicknesses at various heights in the model's images. If those questions are answered to your own level of satisfaction then: There is mention of an ender 3 board, but what printer is this from, does it have a sturdy frame? ( i didn't see a printer or model of printer named but it is possible i missed it in all the reading) Is your machine sturdy on the x and y rails? any slop or play. Have you printed a xyz cube to test x,y,z size, and is it within your desired specs? This issue is probably more visible because of what appears to be under extrusion. This octagon was printed at 20,30,40,60,80 mm/s (bottom to top). Here is my script: G-code generator to test E-stepper microstepping I’m still not sure if my Hemera has something wrong, or it is just the result of this particular combination with the Ender 3’s stock board. A slanting salmon skin can also be produced when setting the extruder step per mm slightly different from the firmware’s setting.Ĭorrecting the vref to 0.96v helps a little. ![]() I can produce a perfect vertical salmon skin when setting the extruder step per mm equal to the setting in the printer’s firmware. The result confirms that the pattern aligns with the E-stepper’s full step. I created a single wall octagon that each side has n * (mm per full step) long. To verify this observation, I wrote a script to generate G-code that will align the extruder’s full step on every layer. It seems like the extruder only moves on full or half steps. I tried to print even slower, and noticed that the extruder pulled the filament in not smoothly. What!! I always think that print slower = better result. The salmon skin pattern stays the same, but it’s much stronger when printed slower. I printed a cube in vase mode and got salmon skin on all sides. Increased vref to 0.7v, calibrated e-steps, etc. Background story: I bought E3D Hemera and wrongly set vref to 0.5v on the stock Ender 3 board.
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