Universal Desktop clamp spool holder

A universal spool holder for those of us with small desks or limited space on their desktops.
Despite it is not very compact, it should be useful if, like me, you do not have a lot of room on your desktop. So I designed this thing that clamps on the edge of the desktop or tabletop or shelf or whatever else you need it to clamp to (up to some 35mm - 1.3 inches thick). That is it's main feature.
The adaptability comes at a price though. The clamp can be a weak spot as the PLA can't take a whole lot of force. Regular PLA and PLA+ might deform in time as the clamp is under constant stress, and if any significant heat or prolonged sun exposure is involved, that time will be quite short. An M8 threaded bar 2 nuts and a wide washer will be required. I used PLA+ and it worked for a while, then I came across some PLA - CF (8% carbon fiber) which is much more stiff and used that as well as strengthening with the M8 threaded bar and it still works with no issues.
For the top part, the actual