Hi I have a 6 pin Unipolar Nema 17 is it possible to used with sanguinololu 1.3a pololu steppers or convert it to bipolar

thanks in advance

Yes, ignore the centre taps and use the full coil for maximum torque or use the centre tap and one half of each coil for maximum speed.

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[www.hydraraptor.blogspot.com]

How can I do it ? I am not going to connect wire to 2 middle pins ?.

The wiki is your friend: [reprap.org]

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Generation 7 Electronics	Teacup Firmware	RepRap DIY