Welding PLA

I printed a model but a 8mm bore was on the wrong place and I couldn’t print
a new part as it take too long.
Some research went me to try PLA welding and it was succesfully.
How:
Take a Dremel and mount some PLA filament, not to long approx. 25mm or 1 inch
outside the drill chuck and as much as possible inside,
straighten the end as well as possible, if not straightened well= NO GO
After some experiment I had the right speed 20000 rmp
It was possible to close the bore and drill a new one a few mm further.
I reworked the surface mechanicaly on both sides.
It took some time but a new printjob would take several hours.

Source

3dprint.com/34351/3d-prints-with-pla-welding/