Is it posible to set print server with LEDE?
Using a pass-through option like p910nd for sure, cups or another full featured printserver which does the whole rendering on the printserver itself would be to taxing for just about any common router (with rather limited CPU, RAM and flash)
Yes, I found useful articles on NET but I could not find some packages like "kmod-usb-printer p910nd" in packages list inside LEDE
added: ups sorry found both 
Both packages are available, run "opkg update" before (and be aware that opkg might run into trouble with just 32 MB RAM).