OK, so I learned how to calibrate E steps, and I think I done it properly (i.e. my 95% rectilinear infill have spaces, while my solid layers is solid). Now I got another question: then extruder head changing directions, it forms small blob of plastic (pointed in red on the picture). Is this normal, or I need to calibrate something else? Thank you.
Try increasing your retraction settings.
Humm. I have the same problem…
If it’s just on the last layer thats normal but from the pictures and form what you said it seems like it happens whenever the print head moves without printing which would be from retraction errors. Alternitively it could be jerk and that would mean you need to tighten your belts and maybe adjust some settings.
All layers have this deformation. Hmm, if this is jerk, it can be reduced by lowering printing speed, am I right? Should check…
If you’ve turned your jerk down in your firmware settings, try setting it back to default or something low like 10mm/s – likewise check your acceleration settings, you don’t want them too low.
What speed are you printing at and on what machine?
It is acrilic prusa i3, printing is 30mm/s (I also tryed 60mm, and things even worse). I guess if it was mechanical problems, all 4 corners will have same distortions from head change direction, right? I feel like this particular corner, is a place there printer ajust it’s Z axis, so there is little pause there (like 0.5 sec). Maybe plastic melts from extruder heat, or there is no (or little) retraction, or something…
@Vladimir_rvo_va_r , this can also be adjusted in your slicer by increasing the retract speed, “wipe”, etc. I didn’t think any slicers did the zipper pause anymore, but apparently you’re getting that.
That shouldn’t be too fast. There’s a chance you have dead zones in your printer but that’s uncommon. Try increasing your retraction a little (I have no idea what it is now) and then print several of the 3mm cubes evenly spaced out in your build area at 45mm/s or even 60mm/s to exagerate this effect and post some new pics.
@shauki You should just calibrate the extruder and that’s completely unrelated to this problem, he already calibrated his extruder.
Try printing a large circle, as large as you can print and still measure with a caliper, I’m interested if it will be ovular.
this is not normal, see Advance Algorithm in Marlin/Repetier. Also if You increase acceleration/jerk (not increase speed!), the blob will be smaller/thiner. And acceleration of Your extruder should be 10000 mm/s^2, max speed 100 mm/s. Aee also: http://www.dr-henschke.de/advance.html