Most likely the culprit is the roller (Bell Crank #623190-00)
Unfortunately, the part is obsolete and no longer available - you may get lucky and find one on Ebay or by doing a Google search
SOURCE: Jigsaw will not, for love nor money cut straight,
Problem has to be the blade is not coming straight down and straight forward.
So it sounds like a bit of play in the mechanism, or slightly bent shaft.
Just buy another one, and buy another brand.
If the same brand and model is sold at box store, then clean it up and take it back as defective.
If this is expensive professional model, then look up a service center and send it away for repairs, but don't expect it to be better, and then be surprised if they fixed it.
We used to keep two of every tool on the job in case of failure, and then we didn't have down time if tool needed repair.
But most of the time. I just bought another one so we could keep moving. And took old one to pawn shop.
SOURCE: This jigsaw seems to suffer from the same problem
I can't speak to the diffuculty you're having with that particular model, as I haven't used it. But in general, the stability of the cut depends upon the guide mechanism of the saw, and a three point guide is better than two point or single point. A three point guide assemble will hold the blade firmly locked when inserted into the column, will have a roller bearing that supports the center of the blade path, and will also have a finger pinching mechanism at the base near the material, so the blade can't waffle in the cut. Aside from changing saws, all I can recommend is that you make sure the base is correctly locked in place at an angle square to the blade, when fully extended. Check this with a small trysquare against the base, and look from both sides of the blade. Some folks will even attach an auxiliary base to stiffen theirs up, though this shouldn't be necessary. Then make sure you're using a sharp blade with the correct tooth count for the material you're cutting, and don't force the cut. Let the saw do the work, and make sure you hold the base firmly against the worktop as you cut. If you force a cut with the orbital action on full, you'll get more deflection.
Other than that, all I can say is that I've had good luck with the newer Bosch jigsaws, and the best cut I know of comes from the Festo, but we're talking serious dollars there.
Good luck.
I hope this information allows you to resolve this issue. If you need further assistance, please post back with a comment to this thread.
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SOURCE: blade wander
a jigsaw is for cutting wavy lines if u want a straight cut use a rip saw with fine blade but you still can use a jigsaw must have sharp blade there is a blade u can get now from screwfix with a triangle spine on the back off the blade to prevent it twisting works fine (also do not push hard on the powertool let the blade do the cutting less likely to wander hope this is of help
SOURCE: will not cut straight lines
Tension the blade so it's correct tension.
If you need further help, I’m available over the phone at https://www.6ya.com/expert/craig_3fa289bf857b1a3c
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