What I mean is, the surface(s) where those supports touch WILL be blemished, whether it be in the form of a bump, or in the form of a crater when they snap off. So any surface that is facing the bed (even if at an angle, will not be perfect, period, so be prepared for that.
While we all complained about the wax messing up the Projet surfaces of FUD and FXD, at least they are somewhat manageable with sanding/ scraping or priming. The SLA process will be much more work (as I have found) to bring those nice surfaces back.
Not all designs have a surface or edge that is expendable to these supports.
For instance, my turtle roof was printed on an SLA and sent to me for comparison to my FXD and FUD (In ALL fairness, the person who printed it for me quickly threw supports on the part for printing using embedded support software- some people DESIGN supports adding to design hours). My comment here in no way is meant to be a criticism of this person or of anyone using an SLA machine, it is for awareness and my opinion only.
The main surfaces were in fact outstanding, roof surface, outer ribs, and ends, but three negative (again IMHO) things occurred:
1: Support spacing left unsupported material to drape between the supports, leaving what should have been a perfectly straight mating edge looking like a telephone wire between poles
2: the interlacing of the supports can create unintended stress vectors when trying to remove the support structure with nippers, and ended up cracking the surface of the roof- I would recommend using a dremel outside with a mask so as not to breathe in the fine particles, and then carefully cutting off any remains with a cutter.
3: Supports had to be added along the mating edge of the roof (which needs to be perfect for a mating joint) and some of the supports broke off with material that would otherwise been unaffected by a FUX/FXD print
Another negative effect of the SLA process is all of the wasted resin in the support and a support base that is printed first and that you will be paying for but not using.