Multi Material - Pure Tower Failure

Flagship K Series Creality Flagship K2 Plus & CFS
1

I bought my K2 purely for the use of multi material printing so I can use specific filaments for support. I have tried using PLA as support for PETG models and PETG as Support for PLA, either way if the tower is to large it fails (collapses ) during print ruining the entire print. This is very frustrating. Any body have a workaround?

2

The problem is that these filament types do not stick so good on each other even on prime tower and therefore it is not as stable then.

2025-02-15_152729
2025-02-15_1527291029×1011 142 KB

Some possible solutions all seen in above menus:

  1. Remove prime tower and increase flush multiplier to 2+
  2. Increase prime tower size (40 to 60) and brim
  3. Set flag ‘No sparse layers’ if you do not have so many layers with change but be aware that prime tower needs to be far away from model
  4. Remove the ‘Flush into objects support’ flag

This is what I would start to try aside using HIPS for PLA support.

3

I already tried increasing the size of the purge tower to 80mm with 85mm pure in addition to increasing the nozzle purge to 120%. That did not work, this was a 2 day print that I had to interrupt mid print because of the tower failure. I considered using hips but it emits toxic fumes and the printer is in my living space. In addition the solvent that needs to be used to wash off the filament is also toxic. I am now printing without a tower and I increased the purge to 130% . In the calculation you sited above what does 550mm = in terms of % which is what the value in the slicer specifies? Also this is a lot of filament waste not a very attractive option.

4

Ok, I 4got 2 mention that there in the support settings to print only the interface with another filament. Did you use that or print all the support in PETG?
Anyhow, this option helps many time also to reduce number of filament changes and make the raft then stronger.
If you are using Tree support avoid setting Adaptive layer heigth or use Organic to reduce layer changes as well.
This options are only the ones I check when I have problems with support but I rarely need to use another filament for support because I try to design objects rather to be glued or build together instead of creating a lot of support.

1 Like
5

Thanks Frank, and yes I use that option exclusively all the time.