This is a remix of the original funnel by Kyaenos for his Silica dryer spool. I added a thread to screw it onto the dryer spool. It fits the spools thread quite well and therefore the funnel cant fell off while the silica is being filled in.
Print the funnel up side down, so the thread is at the top. I used variable layer height, so the thread is printed fine and save printing time at printing the lower funnel part.