[Ruling on Printing for Adherents of False Doctrinal Sects]

Answer: He ought not print, for pay, what he himself judges to be false in creed. He may print works of furūʿ (practical legal branches). That is what the evidences indicate.
Yes—selling such works and trading in them for those who will benefit within their own school is permissible, and likewise printing for that purpose.
Source: Min Thimār al-ʿIlm wa al-Ḥikmah vol.2