Summary

King Rex with movable jaw. Jaw gap 0.30mm(CR-10S) is suggested for 100% printing. Try Rex1 head keychain https://www.thingiverse.com/thing:5182442 first to ensure the acceptable jaw gap of your machine. Larger jaw gap can be used for smaller-scaled printing(e.g. 0.4mm for 75%), and smaller gap can be used for larger-scaled printing(e.g. 0.15mm for 200%).