I have a Samsung side-by-side fridge in the garage...here we go again...LOL...
I had issues with ice building up on the Samsung freezer side floor and running out under the door gasket. After several thaw outs It was apparent that the drain was clogging and the melt from the defrost cycle was just draining down to the freezer floor and re-freezing and getting bigger and bigger...like a glacier...until it forced itself past the door gasket and started melting on the garage floor.
As you have discovered, the freezer drain tube on the Samsung fridge is not very large. Nor does it appear to be a straight drop, allowing stuff over time to collect and hold water, which eventually freezes into a permanent plug.
My solution??? i got a piece of solid core electrical wire. The kind that is in your house walls. I striped it down and took a single piece several inches long. I snaked that down the drain hole and wrapped the end around the defrost heater coil. Copper is an excellent conductor of heat, or cold. So when the defrost heater comes on, the copper wire warms up and heat travels down that wire into the drain hole, melting any frozen water, keeping the drain flowing.
The problem has not returned in several years...
