Phrozen Sonic 4K Resin 3D PrinterIntroduction: Phrozen sonic 4k resin is specially designed for the dental industry, the sonic 4k offers built in parameters for dental applications that work to print out all the dental models you need with high precision and accuracy. with a super high resolution of 722 PPI, this printer prints at 35m, and offers an ample printing space of 6. 1,. youll also be able to print one layer in only one second, which is twice as fast as the sonic mini 4k!