This Knock Box is made of 3 different parts: Box, Base and Pin

I suggest printing the box with PETG and 40% infill to give it some weight and resistance.

I do however suggest a flexible filament for both Base and Pin. 40% infill for the pin to give it some additional rigidity to withstand the impact from the portafilter and 15% infill in the base to allow it to better absorb the forces and prevent the whole assembly to slide.

Materials and printer used in this build:

• Box printed in Raise 3D Pro3 Plus with Fiberlogy Matte PETG, 40% infill

• Base printed in Prusa Core One with Prusament TPU, 15% infill

• Pin printed in Prusa Core One with Prusament TPU, 40% infill