Something makes resistance at 9cm tall. I think it is that the guides are quite tight. If I release them more, I lose a right angle with my arm: S

I have achieved a fairly acceptable quality, but now the problem is another, I cannot find a stability in the Z axis guides so that the Y arm is straight and is not tight enough so that at a certain height the Z motor has problems. I put a photo of the result: The problem was that when it reached that height, the Z motor stopped being able to climb.

In the end that was not the problem. I thought I had fixed it but it was one of the power supplies that was failing. I put them inverted and the hot bed worked but the printer did not receive enough power (so the base fan did not make noise) Now I have to get a new power supply with the same characteristics. The blue led of the power supply that fails flashes constantly, it is rare that it fails if it is practically new ... Do you recommend any model?

fixed and curiously not because the base fan makes less noise :S

When doing the heater bed test, the red led turns on but now the temperature does not rise, everything was correct until it stopped working.

@Michael G Thanks for all the help, I found this very useful. I just wanted to ask you one thing, do you have stl of the guide that you use for the outside of the bearings? And what is the piece that you put inside this support? https://static.wixstatic.com/media/a27d24_d3ff21ab101347899993c844dbdf2e17~mv2.jpg/v1/fill/w_680,h_510,al_c,q_90,usm_0.66_1.00_0.01/a27d24_d3ff21ab101347899993c844dbdf2e17~mv2.webp Thks