The portafilter locks in and seems like it isn’t correctly positioned until you bring the piston down to engage the one-piece 58 mm barrel and basket, at which point it aligns itself beautifully, stabilizing the portafilter in the group.
The tamper fits it precisely and is held very brilliantly in either of the Robot’s “hands.”
The removable two-spouted bottom of the portafilter has a friction gasket of silicone, again, a perfect fit and already demonstrated. It’s additionally relatively hefty. Since the inventor of this machine is an accomplished machinist, the tolerances are fantastic.
The piston, basket and portafilter are stainless steel.
There are two variations of the Pro basket available, formulated for fresh espresso from a proper espresso grinder, and the pressurized basket for coffee that is pre-ground for a moka pot and can be acquired at various grocery stores. This is additionally the Barista version of the Robot, equipped with a removable pressure gauge.