They reply pretty quickly to me. Check your antispam folder?
The nozzle usually not going to actually be clogged unless you are running crappy filliament. Check your idler arm tension springs, there should be 8mm between the two washers on either side of the springs. Also check the small gear setscrew.
You will also want to get a cheap point and shoot infrared thermometer from your local tool or auto repair store ($35 U.S.) and check that the heater core is close to what it thinks it should be.
You will also want to open the filliament chamber, clean all the plastic out of the hobbled bolt and any shavings. Cut out and remove any sections of filliament with ground out c shaped sections in it.
Now move the nozzle up off the bed, heat to temperature and extrude 100mm or so. If it is extruding fine there, but not when you stay a print, you are either too close to the bed, or overextruding. Or the part is lifting off the bed. When you extrude molten plastic, it is essentially a noncompressable fluid. If the nozzle tip is blocked by being too close to the bed or by the solid layer ending up too close to it because of overextrusion or lifting, it basically is the equivalent of trying to extrude through a brick wall. It causes the solid filliament to come to a stop, which makes the hobbed bolt cut a c section out of it, ruining your print.
An actual clog is exceedingly rare, all evidence to the contrary. If you think it really is a clog, heat the nozzle to about 160, just warm enough to be able to pull the filliament out manually. Undog the extruder latch and gently but firmly pull the filliament out of the hotend. If it wont come out, bump the temperature up a few more degrees and try again.