Priming tower keeps falling down

Bambu Lab H2D
1

Ok, about ~250 hours into my H2D at this point, and I have a decently big problem.

After around 900-1000 layers of printing, my prime tower will get knocked over

For a while, this was a problem on my models as well (things like supports being knocked over), but disabling “reduce infill retraction” solved my problem.

Now I am still getting my prime tower problem, which tends to cascade into bad printing quality since im dragging material over to my model and its randomly sticking to it.

Any idea how to solve this? My current “solution” is to buy a glacier plate and hope that with more brim the prime tower will stay even if there is nozzle collision, but I would ideally like to not have the collision at all in the first place.

I’ve attached the disaster that is my current print.

molecule
molecule1920×2550 463 KB

2

You can try:

Set Z hop to 0.6 mm and switch Z hop mode to normal

Wipe to normal mode

Apply Nano Polymer Adhesive at the location of the prime tower

Reduce travel speed to 500 mm/s

I don’t know what filament this is petg ?

You can also reposition the prime tower to the front right if the fans are affecting its current location.

3

need to know what filament you’re using

4

Thanks for the replies,

The problem has persisted with the prime tower in the back right and front left corners of the build plate.

It has happen with BL black PLA, this was BL pink PLA and ERYONE glow in the dark PLA (and PETG for interfacing).

I have disabled the setting that makes the nozzle not zhop over nfill, and that seemingly helps a bit, I will also try to change the z hop height.

5

You may probably want to look into several threads about bed heating issues or plate adhesion problems. As several users reported somewhat similar problem with a print being knocked out if it’s in the corners of the plate.

6

You can also change the size of the prime tower and the size of its brim. It will get more stable if you make it bigger (and uses more filament) and/or increase the brim (very minor increase in filament use).

7

You could also reduce the auxiliary fan speed to around 30–50% range.