How to make filament profiles available with custom printer?  

Best Answer by Neophyl:

How are you running alpha 4 ? there isn’t even an alpha 4 tag on GitHub yet, just alpha 3. 

Anyway the filaments are vendor locked to specific vendor profiles. To use them on other vendors you have to select one by selecting a machine that can access it, such as a Prusa machine and then there a detach preset button. Once it’s detached you can then save it as a copy. At that point your ‘new’ filament becomes accessible to any printer, as long as there are other restrictions in the compatible with fields. 
One of the reasons the filaments are vendor locked is that they often include specific linear advance values tailored to the printer which won’t be applicable to other printers so be sure to remove or modify those settings in your new saved copy.  

Vendors spaces are the new way that PS organises profiles while the compatible with fields are the ‘old’ way but both can and are used to limit things. Even Prusa Mmu printers don’t have access to all the profiles for filament that the non mmu ones can use. 

Also remember that any profiles created/used in an alpha are completely separate form those stored and saved on a full or RC release so any you create now in an alpha will have to be copied over.  The simplest way to do that is to use the export>config bundle option and the. The import config bundle to load. A config bundle will save any non standard custom profiles to a file. It’s the easiest way to transfer custom profiles around from machine to machine (and alpha to beta to rc ) and also is a good way to make backups.