The filament came out during a print and I don't know what layer it came out at. I've spent a lot of filament on this print, so is there any way to continue it?
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depending on where in the layer it failed, this could cause more problems. It'll try to print the layer from the start it may get messing (especially if you're missing perimeters, or printing over partial-layer perimters.)
The other issue is that homing may be slightly off; that would depend on the printer. (most are okay, but you might find a visible layer shift in the seam,)
Agree that the result won't be a perfect print, but I personally prefer this route over printing the other half, sanding the first half flat to account for a partial layer like you said, and then gluing.
I guess it comes down to what you goal is. 90% of my prints are functional and I don't really care if they're a bit ugly at times.