If the joints work some of the time.. Thats your printer. All that does is solidify it: Your printer is not consistent. You do realize the model is 100% identical every time you download it, right? Thats not the inconsistent part. Your printer is.
The print shouldnt be 24h unless youre printing at 10mm/s..
Also, you do realize it can be split into 3-4 seperate 2-3 hour prints? I printed the largest portion of the body in 3:15..
Scaling it down makes the tolerances tighter. Dont scale it down if your printer cant handle it. There's your proof that scale very much has everything to do with it. Im not being belligerent, you are. If you cant see that, then well..