today i learned the hard way, printing a sphere-like object is very difficult!
mine looks more like an egg :-/
so not only the general calibration must be fine, but also the supports must be set right!!

with this sphere you can experiment with...

• more/less perimeters
• with/without automated supports
• manually generate few/lot supports only on one side of one axis. example: you only add support to the left side of the x- and y-axis, but none to the right side. that way you will encounter the results with ONE print and you don't have to print many of them.

to change your settings, please look at the original calibration cube for more information

IMPORTANT:
with most slicers you can add a brim automatically by enabling skirt/brim and set the distance to print to 0mm
in case it doesn't work, i added a second version with a 20mm brim ;-)

First Test:

• 1st quarter - little bit of supports
• 2nd + 3rd quarter - no support at all
• 4th quarter - lots of support!!
• <10% infill
• part cooling active

Learned so far:
support ist VERY helfpull in terms of cooling the perimeters down! even my part cooling fan was not enough to compensate the remaining heat in the print. so the perimeter walls were still too hot to become solid before the next layer was printed. as an result, the print failed in the 1st, 2nd, and 3rd quarter. the 4th quarter had lots of support, so the perimeter had enough time to cool down and remain its shape.

Result & Solutions:

• reduce heat!!
• if you want to print a small sphere-like object, make sure, the material has enough time to cool down befor the next layer will be printed.
• --> print multible parts the same time! so the printer has to leave that one object alone for a while and it can cool down
• --> reduce the temprature of your printer and printbed.
• --> add an additional part cooling fan. even a hand-ventilator from summer helps ^^