HE3D K280 (and any delta) printer frame stiffeners / support

##Instructions have been updated to be more clear
##Part selection has been simplified to reduce confusion

Follow my project here: https://crunchysann.com/BL/projects/

These braces are designed to be mounted on the [HE3D K280 delta printer](https://www.amazon.com/HE3D-Printer-Printing-280X600mm-Heating/dp/B076FT5RQK/ref=as_li_ss_tl?keywords=k280&qid=1556194069&s=gateway&sr=8-1&&linkCode=sl1&tag=crunchysann-20&linkId=5caee1fcee30eeb1e4a9860b94680b74&language=en_US) to make the frame more r