3030 120degrees (or 45) connection stiffer

I was quite surprised how few of this 120 degrees connectors is available to download, for 3030 it was none, so here one is :)

I printed it from pla (as i think it is not that  bendable as petg), 

0,25 structural,

5 perimeters

5 top and bottom layers

3d plastev :) infill, 15%

Ehe, it is silk pla as i just had it loaded in printer, for real i will use pla+.

And at the end, my huge thanks to kajzwin original model author.

Changed for 3030 profiles (increased size of object to 30mm x 30mm, change the square thingies to fit 8mm t-rack)