Hi guys,
I’m struggling with an aesthetic issue printing a sphere and cannot figure the reason. This issue happen only on the first part of the print, the other part is perfect. . Can you help me about that please? Thanks in advance.
Welcome and I have to say I can’t figure out what I’m looking at and what is the probem. You said sphere but I see lots of undulations in the perimeter of that picture which looks like it’s not a smooth sphere.
What 3D printer, what slicer program and can you share the model. It might also help to see how you have it oriented on the slicer.
And just to let you know, printing overhands( look that up ) means you want to print your perimeters from the inside to the outside. Overhangs are possible because the layer above can be printed just slightly offset from the layer below but if you start the perimeters from the inside then the outermost perimeter is ‘sticking’ to not only the little bit of the lower layer but it’s also sticking to the previous perimeter.
The other thing to do is to reduce your layer heights. For a .4mm nozzle I usually use .2mm layer heights but for somethings I’ll go to .16 or even .1mm layers. Takes more time but produces better quality.
Hi Dougl! Thanks for your time and your answer. I’m used to print sphere for a while for my work, with textures and relief without any problem. In this case i did several tests and the result is almost the same. My last try will be to put support around the first full quarter. I usually print this kind of geometry from to the inside to the outside for the logic reason you said. Infill printed first too for the same reason. So normally the spheres I print a perfect. This is my professional work, that’s why I cannot share the model. Orientation is fine, I work with Bambulab PS1 and their slicer. nozzle 0.6 at 0.42 layer height, setting that normally print perfectly. The infill/wall overlap help in this case too. Speed of inner wall reduced to 50 mm/s combine with large slow down for overhang. filament dried for hours before printing…
then if it’s the uneven curved extrusions seen on the top pic you’ll want to watch it print and see what the next inner perimeter wall looks like. If it too is uneven and inconsistent then it’s not because of the overhang. Then you need to look at your filament temps and diameter to see if they are consistent and look at the extruder gear to see that its not partially clogged and isn’t gripping the filament consistently(uneven pressure). Also test your nozzle diameter to see if your .6mm hole isn’t worn to something larger so the slicer calcs aren’t generating enough pressure to make consistent extrusions. One way to check is to see if a .6mm nozzle cleaning drill is loose iin your nozzle after you pull out any plastic in the nozzle. Or swap out the nozzle for a known good and the extrusions improve.
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