Hi,
I wanted to print with petg as support on my Pla print. This worked great until the printer tried to print pla above petg on the Prime tower. So what it was supposed to be in the model - bad sticking between petg and pla is really annoying on a prime tower. The pla had no adhesion at the petg tower and was just getting spaghetti. So the tower failed and later the print.
Is there any setting to print different Prime towers for different materials?
Looks like what you asking for is already open in Orca as feature request.
Here is the work around: Separate prime towers for multi material prints Ā· Issue #8474 Ā· OrcaSlicer/OrcaSlicer Ā· GitHub
We have found a workaround for this as outlined below:
Manually add one cylinder per material type that are the same height as the last material change
Apply one material to each cylinder
Make sure that the added parts are before the printed parts in the object list
Select āIntra-layer orderā to āAs object listā
Taking all of those extra steps forces the basic behavior we are looking for, and the cylinders are effectively prime towers due to the forced printing order established in step 4.
This might also work, from discord chat:
I believe, but donāt remember right now, that you can set what the outer structure of the tower is made of. Then it just uses the inner structure for prime lines.
Yes, @Wyphorn.
Not a bug, just a default that needs to be changed.
In the Multimaterial print settings, you can change the prime tower material from Default to whichever is the primary material in the drop down. When you slice, you should then see the shell is a single color.
Default allows it to choose the most efficient regardless of material. Fine for multicolor.
If all materials used donāt stick to each other, need to switch to tell it explicitly to print the tower shell in one primary choice. Ideally you choose whichever one is used in the upper most, or at least the most layers since this will be called on every layer.
This is another great application for Breakaway material for PLA if doing multicolor prints. So far, itās worked fine for me even inside the prime tower shell. 
One other thought here - change prime type to Rib instead of Cone/Auto etc. The Rib style prime tower will prevent fall over, and with the interlocking features described above, you can achieve a good prime tower with PLA/PETG mixture.
Iām a huge fan of Support for x material! However, with only 4 Toolheads it can be hard justifying a slot for just that. With my 8 AMS slots itās generally a no brainer.
Is you havenāt used Support for material and think itās a waste of money, you are truly doing a disservice to yourself. I thought that way, even buying some and letting it sit for months in the box, but the results are perfection 
Zero Gap offset from material to material provides the cleanest overhangs Iāve seen 
I managed to figure out steps 1-3 but cannot seem to locate āintra-layer orderā in the menus.
Good to see that there is an Orca feature request. Can we expect the Snapmaker team will keep Snapmaker Orca up to date with the rest of the main fork of Orca with its feature updates as they come available?
