It says efficiency 17%, does that mean i have 17% chance per hour to craft one? And if i dont get one during a hour do i lose money?
Yes, it's only a 17% chance to craft. No, you don't lose money for stuff you failed to craft.
Also, don't craft at low efficiency places. Try to find a high efficiency fief that is NOT 100 gold/hour to stay in. Ilvia (my fief) is currently at 100% and 10 gold/hour. I might lower it to 5 gold/hour if you ask nicely
EDIT:
Not entirely sure, but I think efficiency determines how much cheaper it is to craft that item instead of buying it.
Could also be the chance percentage ever hour(would be my guess). Could explain why you haven't gotten anything.
Did you chek your money? Crafting is quite expensive. If you don't have any income on Strategus, that is.
It's crafting chance, not how cheaper it is to craft. The discount depends on your crafting skill (if equipment) or is 50% (if Goods).