Adjustable cross stitch stand.

knob v2 has a grip, for for strong tightening
clamp lower v1 for any size of frame
clamp lower v2 hold more stable aprox. 30cm frame

update 2023.05.23: I posted a 150mm lower and upper holder for smaller printers. The standard version is 180mm high.
update 2023.06.18: I posted a shorter arm version.

You also need:
4 x M6 nut
4 x M6 dome nut
4 x M6 hex bolt (1 x 60mm, 1 x 50mm, 2 x 40mm)
4 x M6 35mm furniture bolt
1 piece of plywood (30cm x 15cm)