Is it possible to do piece printing with the printers?

Definitely. You have two choices:

P series Economy Garment Printers are designed for both Garment and Piece Printing. You can printing on  Denims, night robe and apparel decorating easily.

T series Multi-function Garment Printers. Grand or Super Grand pallets are optional parts. Here are the size of them.

1700mm*1080mm (Grand Pallet) for T6C

2400mm*1080mm (Super Grand Pallet) for T10C