1

"I'm writing with a pen"

"I'm writing with a pencil"

"I'm drawing with a blue crayon"

and so on.

ボールペンかいています。

or

ボールペンかいています。

or what do I use?

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3

ボールペンで書{か}いています is correct で = "by means of/with" in this context.

Your other sentence ボールペンをかいています would literally mean "I am writing a pen" which doesn't make any sense.

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