/diy/ - Do It Yourself

Hey,
I'd like to 3D print hinges for my ancient laptop following /g/ advice. My school has a 3D printer and I'm a complete newbe to 3D printing but still I'll have one attempt to print it. Could you help me /diy/, please?

After googling I decided to order 10m of an abs fillament, is it a good material and is that enought for something that should be around 2x3cm + and 0.4cm "deep".

I can't decide on software to model it, I know only basic blender but it doesn't seem to be good for precise dimensions models. Also software for cutting is provided at school computers, so I'll contact the person who oversees printing.

Also how should I make something that by definition has an axis and two objects connected to it and one is rotating around it?

And the final question the printer has 20cm printing limit. Are there any ways to print bigger objects if they'd have to be as 1 part?