<p>Recently my RAMPS power connector caught fire while heating the heated bed. I suspect this was a defect caused by the connector, and de-soldered/removed it as best I could. I'm  not an electrical engineer, so I'm looking for advice on whether It is possible to re-solder the power connectors directly onto the board, or I'm just risking another fire. Here are pictures of the top and bottom.</p>
<p><img src="https://i.stack.imgur.com/BFnKQ.jpg" alt="Top side of PCB and underside of power screw terminals, showing burning" title="Top side of PCB and underside of power screw terminals, showing burning" /></p>
<p><img src="https://i.stack.imgur.com/oWCMH.jpg" alt="Underside of PCB" title="Underside of PCB" /></p>

The blue clips stick in the connector on the extruder end of the feed tube. They are to keep it from opening as the printer extrudes and retracts filament.
To install them, push them in between the white part of the fitting on the feed tube (not the hot end). You should only need one or two, and they are all of varying thicknesses. If you're not familiar with these fittings, I found a
YouTube video
on how to use them.