Rendering is a process a computer goes through while it calculates how an image should look, this is often done by a separate program for instance mental ray or render man
ankylosis of a joint means fusion of the articular surfaces renderring the joint immobile
The copier as well as the printers are going to be repaired by a technician over the weekend. Is acceptable but a little lengthy since you are using some unnecessary words- The copier and printers will be repaired by someone over the weekend. This says essentially the same thing, sounds better and uses 6 less words. Since you didn't specify which printers, it will be assumed you mean all of them and the person renderring the repair will be assumed to be competent so you can use a general term like someone (personal preference) although you can use tech instead which sounds more professional or to pinpoint the person if you feel it is necessary and or they will know/need to know who/company you are referring to.