The same day updated: New parts for 2020 aluminum profile.
Sometimes when you want to attach stuff to the aluminum profile, you must disassemble the whole structure. It's really miserable :(
Now we have this, just 4 parts can be easily printed without support, just download and follow the diagram pictures and try. You can also use your own parts to replace the "Clip_holder" part.
The files uploaded are for "4040" aluminum profile, I will make a new one for "2020" later.
Welcome to upload your specific holder parts in remixes. Enjoy!
See my other designs at:
https://www.thingiverse.com/wuguigui/designs