Just curious, What is the preferred build plate surface for this material?
You mean as in officially or based on what people try?
CF is bad for the hardware and CAN damage the build plate as well.
After all those fibres do move when the filament is hitting the plate until the settle in place.
On my old printer I preferred kapton, or polyimide film for nylon, be it filled or plain.
If you can cut glass try kapton tape on it.
Otherwise I am sure some local glazier can cut you a build plate from some leftovers.
The tape is cheap enough as a consumable if you don’t have to replace it on a daily base due to the print volumes or due to being inpatient and not waiting for plate and part too cold down.
A great alternative if you print a lot in CF might be TK99.
If you want to try it cheaper look for FR10 build plates.
Minimum thickness shall be 3mm as otherwise I find them too flimsy.
Basically everything sticks to this material with an acceptable and often superior bond compared to other smooth plates.
Plus it is quite scratch and chemical resistant.
Does not mean of course it is harder than carbon fibres…
Especially if you really squeeze the first layer the most used areas of the plate will turn dull over time.
The key is to use a slow speed, small extrusion width for the first layer and a temp that keeps the extruded filament soft enough.
Unlike coated steel plates or those with a sticker on it the FR10/TK99 plates won’t go bust as soon as the surface shows the tiniest of imperfections.
Even once quite rough they still provide a nice bind you just have to accept the dull looking surface areas on the underside of your print.
Only downside it that you need clamps to secure the plate, that the plate is NOT flexible and that you have to ensure to allow for the required time for the top of the plate to reach print temps.
Officially,
Seems like Bambu changed the buildplates they sell a bit- or atleast how they are named.
Is the Bambu smooth PEI plate what they are recommending for PAHT-CF? They sell a sheet for it that is listed as “high temp”, but its not clear whether this sheet is the same as what comes on the smooth PEI plate.
Is the standard textured PEI plate not ideal for PAHT-CF?
Textured PEI works.
I just prefer to use FR10 
I use the Engineering Plate. Add the glue stick. This makes it easier to remove and the build plate remains intact.