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There are several ways of doing this but this is my method which has
enabled me to cut away many parts with no damage or breakages.
To begin with I use a panel scriber which is actually a dental probe -
exactly what that over priced BMF panel scriber is. Its purpose here is
to deepen the groove a little for the knife blade later on, as you can
see its very effective and removes a slither of plastic.
You could infact use the scriber alone to work your way
through the plastic but the reason why i dont is because as it cuts
deeper, the cut will become wider too. With the knife blade you wont
have this problem.
So now that the gvoove has been deepened slightly, it
provides a guide for the knife blade to run along. Without this, the
blade is very likely to slip and score new panel lines in unwanted
areas.
I cut along the lines a few times with the blade the
right way around then give them a few passes with the back of the blade
which removes platic from the previous cuts. I continue to alternate
like this until its worked its way through.
And thats it, the part is removed cleanly and with no
damage to the model or fingers. Also take your time and dont apply to
much pressure - let the knife do the work.

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