The cavalry posted here are designed to accompany the infantry at:
Please go there for additional generic information
These cav come in two 'flavours' - one a spear throwing/wielding helmetted figure and the other in a 'couched lance' style.
They are one-piece models with separate shield to use as and when required (so technically not a one-piece model, but the rider is attached to the horse - you know what I mean)
Flashforge Creator Pro
If you want to print a spear/lance, be my guest - I prefer to use a snip of small gauge wire - they take more of a battering on the wargames table