I cleaned up my Flashforge Creator Dual tonight, and loaded some transparent ABS prepping for a print. The filament extruded fine, then started to wiggle, then became fine again. Hot end is 0.4 mm and was heated to 230C. What sort of steps should I take to troubleshoot the issue? Has anyone seen this before?
If the filament displayed in the photo is the result of unimpeded extrusion from your nozzle, you don't have or have not described a problem. Filament extruded from a hot nozzle will react to many things. If a slight air temperature change is created on one side of the extruding filament, it will cool faster than the other side and curve in the direction of the cooler temperatures.
If there is a bit of old filament on the tip of the nozzle, it can cause the filament to hook back on itself, creating an interesting squiggle of filament before the weight is sufficient to cause it to drop.
A typical 3d printer problem is related to the results of a print or an obvious mechanical failure. Wiggly extruded filament is not a symptom of a looming failure, unless you have other indicators.