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resolution of circular cross section


henri
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Posted · resolution of circular cross section

After I installed my Olsson block from Fbrc8 (with adventures) my Ultimaker 2 hit a sweet spot and is performing particularly well. I printed a tapered cylindrical pillar using 0.06mm layers and really cannot see the layer lines, so cancelled my idea of a pseudo lathe to rotate it in order to smooth it with sandpaper.

However I noticed that the circular cross section is actually a polygon. Difficult to count, but maybe 40 sides, and this is just visible. Is this a function of Cura, or the drawing software, and can it be improved?

The upgrade. What I learned:

Replacing the Teflon piece was a big factor. Of course I should have known if I had been paying attention.

Do not go out and buy a torque wrench and apply 1+ N-M. It is too much. The Olsson plastic one gives you less than half as much, which is plenty.

Of course you have to print it. Either do that with your old setup, or screw in the new nozzle hand tight, and then tweak really gently with a 10 cm or so long 7mm spanner.

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    Posted · resolution of circular cross section

    I suspect you are seeing the sides of the polygon which approximates to the circle. I use Sketchup for design which assumes a 24 sided circle, which you can see the sides. I now set the number of sides to 99 and these are now invisible.

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    Posted · resolution of circular cross section

    Don't set the value too high in you cad software - if the line segments are say 5 per mm it will drastically slow down your print because of how Marlin (the firmware) works.

    Marlin can only read 12 moves ahead and doesn't know if a sharp turn (e.g. corner of square) is coming up on the 13th move so it has to be ready to stop 12 moves ahead and if all 12 moves are in the next 3mm it needs to print VERY slow. It will cause bad quality.

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    Posted · resolution of circular cross section

    Re. the tightening Olssen block preperly, you don't need that silly wrench, just hold the smooth-sided socket in your fingers, and tighten the nozzle moderately using only the socket. If you try to tighten it too much, your fingers will just slip on the socket.

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