Hi Mátyás Végh,
Thanks! That model took about ~100ml of material. I actually made it hollow inside in zb to conserve material, which helped a lot in savings/time! I have some follow-up post and will continue documenting my work over at my blog here, so check it out! http://robertvignone.blogspot.com/ I just finished another print today and will be posting updates on that later.
Bookmarked and followed! 
Thanks a lot, and keep it up!
Oh… and an other one…
This about 100 ml means that this sculpt is full-filled, or is it hollow (so the form is just a thin material form and there is no material in the middle of object) ?
Julien, have you tested any of your Zbrush files in the new update 8.2?
I just tried to look at the files in the preform and it looks like the shifting error visible in the software are gone.
I don’t want to re print the meshes I already printed since it was just some quick mesh ( I am working on a more detailed one and Formlabs still take their time to ship you resin so I need to be sure I have more supply )