Tampstand to fit the Lelit Bianca open portafilter. Probably works for other open Lelit Portafilters too.

Height is adjusted to fit the handle angle and support the portafilter horizontally.

Back part could accomodate a tamper (not sure about the slightly big diameter on the Lelit one), but I fit this model (use round 58 mm base) in there: https://www.thingiverse.com/thing:4819617