Spacer for pipette tip carriers stacked one on top of another

A frame-shaped, essentially rectangular spacer (61) for pipette tip carriers (62) stacked one on top of another, wherein the spacer (61) comprises a horizontal base surface (63), a peripheral side wall (64), which stands essentially perpendicular to the base surface (63) and forms two longitudinal sides and two transverse sides, and an upper surface (65), wherein each longitudinal side and transverse side comprises an inner side (70),

• wherein the upper surface (65) is arranged on an upper end of the side wall (64) and extending essentially horizontally, wherein the spacer (61) is implemented to form a stabilizing support connection with an essentially rectangular pipette tip carrier (62) positioned on the spacer (61),
• and wherein the spacer (61) comprises centering spring elements (71), which are arranged on the inner side (70) of all longitudinal sides and transverse sides, having a springy part (72) spaced apart in relation to the inner side (70) of the respective side wall part (64), wherein these centering spring elements (71) act upon a pipette tip carrier (62), on which the spacer (61) lies with horizontal play, and therefore act as a centering aid or as a twist barrier in the stack.