Keeping the jigsaw blade in line is easier if it's a Festool jigsaw :)
Obviously blade choice can help but it can still be a problem especially if the material is thick.
Hand saw and finish with a plane worked for 100's of years.
Make sure the jigsaw has the oscillation set to 0 as well for those clean and straight cuts.
@Nef started
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Keeping the jigsaw blade in line is easier if it's a Festool jigsaw :)
Obviously blade choice can help but it can still be a problem especially if the material is thick.
Hand saw and finish with a plane worked for 100's of years.