Before the problem occurred, the printer was sent to the repair store to fix the ink cartridge. It was fixed, but just after few printing, it will stop and paper will get stuck. it just go over and over. i tried to search the printer if there's some piece of paper stuck, but can't see one. I searched the net for similar problems and have seen one. I think it's that rubber jammed, because i can still print, then after one printing, paper will get stuck again. Help to this.. Many Thanks. :)
This is actually much easier than you are trying to make it. You can do one of two things to make it simple. Put a box under your toilet and then run a line along the wall to get to the other cast iron pipe, or put in a fake floor. Raise the entire thing 4 inches and run your pipe through that.
Both are extremely corrosive and the reaction between them is very violent generating a lot of heat. A better and safer solution would be to use potassium carbonate. You are not totally correct in your assumption that no toxic gases would be produced. Hot concentrated HNO3 will emit fumes of nitrogen dioxide. I am surprised that you find KOH and HNO3 more readily available in the local market than KNO3. Any laboratory supplier will have it off the shelf.
This will depend upon what plastic resin you need and in what quantities. Large quantities, like for commercial use can be found at sites like the first one below. Small quantities of Acrylic resin (a typical casting material used by hobbyist) can be found in local hobby supply stores and also on the net. Very small quantities can usually be found where Artificial Nails are sold.
