Re: What parts do I need to replace / modify if i use 2020 aluminum frame for Kossel Mini?

I guess 1515 aluminum extrusion is rather hard to manufacture.
Two issues I've found so far when using 2020 aluminum extrusion:
Six vertex frames replacement or modification of the square hole.
Forty five pairs of M3x8 screw and M3 nut need to be replaced by M4 screws and nuts.

I spent three hours yesterday to make 20 mm square hole on a top vertex frame out of curiosity.
The drill bit size was 3 mm.






It looks little bit off.


I think using a precision milling vise and bench top drill press can make decent square hole on any plastic part.
I don't have a precision milling vise at the moment.

Slot width of HFS3-1515 is 3.4 mm at the top.


Slot width of DF2020 is 5.4 mm at the top, which is the same width of M3 nut


I calculated the minimum dimension of metric screw and nut for DF2020.


M4x10 screw will do the job.

The third issue is the linear motion device either rail system or wheeled carriage or another method.

I already bought precut 2020 aluminum extrusion under $10 at a local factory. :)
The technician showed great interest about 3D Printer.