VFAs are horrible - Belt tension too tight

Hello szutsg,

Wow, after all that !

I was contemplating getting the V3 Plus. Looks like I made the right decision not to.

Cheers.

I donā€™t recommend this printer. Fast and reliable, but you canā€™t print flat things. :frowning:
Beside the Bambu security concerns, i would recommend to buy an A1 or A1 mini instead (for almost the same price). I have the two printer next to each other and the Bambu is a much more refined thing.

Good catch on the belt alignment. I went through the same process as you. I also added washers :).

After moving on from the x-axis VFAs I came to the conclusion that the bed design is terrible. I can get 12k+ acceleration recommendations for the X-axis. Y-axis is <4k with double peaks in the input shaper. Thatā€™s worse than my old Ender 3 pro. I spent hours trying to diagnose it. I could tap on the bed and hear rattling. Surprisingly removing the magnetic plate mostly fixed it, but that obviously isnā€™t a solution. I finally ended up designing custom mounts for the y-axis bearings. That let me add a spring that pushes against the rod and that helps tighten up the bed a bit to get rid of some of the wobble there. It doesnā€™t eliminate it completely, but it definitely helps. The design of the bed is just terrible and the amount of vibration wrecks high speed printing. It just isnā€™t possible to get good quality with high acceleration on this machine. The fix might be conversion to linear rail, or converting the bed mount to use 4 bearings instead of the two long ones. Even converting to v-wheels would be an improvement.

I neglected my printer for the last 1 or 2 months but I used it again this weekend for a functional print. I loosen the XZ belts and I printed a rectangle. Belt alignment does not helped a lot on XZ:
the Y surface was fine (almost perfect), the X was horrible.


If i loosen the Y belt i get homing problem recorded here: https://www.youtube.com/watch?v=SINFvR_Mjh0

Hi, I have the same problem on Ender 3 v3 Corexz, did you find a solution?

The best you can do is loosen the belts and print at least 200mm/s on outer walls. The XZ belts can be loosened completely. The Y belt is up to you, but if you loosen it too much the belt can jump off the gear at high speeds.

thanks sleewok
I am printing at 300 and the quality improves, the problem is that I cannot print everything at high speeds. for example when I want to print normal PLA.
Before the ender 3 v3 I had an ender 5 and the quality was much better.

I even tried to print normal PLA at 30 mm and the problem is always present.

Could it be a printer design problem? or engine quality problem.

PS: google translator
I really speak Spanish, sorry.

@CREALITY There are several of us with the same problem, could you solve it?

I have the same problem. I removed the motors, one was hard to turn. The lid was not level. I need to center it. And it became much better. Check it! I will probably change the motors

Tienes fotos de como mejorĆ³ ?

Could you send photos of how it improved?

Having the same problem with VFAs here, Iā€™ve already tried loosening the belts and checking all the screws, itā€™s driving me crazy, I donā€™t know what to do.