Ultimaker S5 will not print PVA support and PLA at the same time

[wimcname 0]

After going through the print head cleaning procedures and making sure both materials are properly sat in the feeders I am still unable to get both materials to work at the same time. I have tried each individually and they work seperately on identical parts but never together. It seems that the material that starts the print is the only one that will work throughout the print. 

[gr5 2,072]

We need more details.  For example:

1) PVA doesn't stick on top of PLA very well so maybe you just need to increase "support horizontal expansion".  The symptom would be that you have tons of PVA everywhere but it's all over the place and not where it needs to be.

2) One or both nozzles just stops extruding.

2a) pla stops

2b) pva stops

 

If the problem is 2b then that makes sense as the pva is sitting hot for a while during time printing pla.  I'd try drying the pva.

 

The second most common problem with PVA is that the filament isn't dry enough.  The bottom layer on the glass needs to be transparent for the entire bottom layer.  Check that.  If not - if it's snowy - then there is water in the filament.  Look at cura or on the printer or digital factory to find out how many meters of pva will be printing.  Unspool that amount and (without cutting the filament) put that much filament on the bed and put the spool on top and put a towel or blanket on top of that.  Heat to 65C for 4 hours.  Then try printing.  To dry the whole spool takes a few days and at a higher temp but don't put the filament directly on the glass bed if you go hotter than 65C.  Try 70C for 2 or 3 days.