Spool holder for P3Steel

''Spool holder prusa i3 with simple cable clip'' by RCNet was a good design but it was not suitable with my P3Steel printer. I looked its alternatives but I was not able to find a simple solution. I decided to redesign the part for P3Steel. Now it perfectly fits there and it is really simple to install. I also added a hole on chassis connection section where you can secure the spool holder even more with a zip tie or a M3 bolt.