Looking for Printer - Need Help

[curious aardvark]

To turn a 1.75mm delta into a 3mm (usually 2.85) mm machine.
All you need is to drill out the holes in the extruder and get a 3mm hot end and feed tube.

Any particular reason you want 3mm ?

To answer the original question.
There's a thread around where someone bought a square framed kit for a reasonable amount.
I'll try and find it.