A partial single-walled pipette tip rack assembly comprising a partial single-walled pipette tip rack base and a pipette tip rack tray, (i) wherein the partial single-walled pipette tip rack base comprises: a) a bottom and one or more base sidewalls, each of which base sidewalls comprises an exterior sidewall surface and an interior sidewall surface, wherein each of which base sidewalls comprise one or more buttresses, wherein the one or more buttresses are bossed, project from an exterior sidewall surface and are of single-walled construction, and wherein the bottom and the one or more base sidewalls are of single-walled construction; and b) one or more posts, each comprising a post inner wall, a post outer wall, and a void between the post inner wall and the post outer wall; which base is configured for use in an automated liquid dispensing device; and (ii) wherein the pipette tip rack tray comprises: a plate, tray sidewalls and a tray flange; which plate comprises a proximal plate surface, a distal plate surface, and a plurality of plate bores; each of which plate bores is configured to receive a pipette tip; which tray sidewalls project from the distal plate surface; and which tray flange extends from one or more of the tray sidewalls and comprises a proximal ledge and a distal rim. (i) wherein the partial single-walled pipette tip rack base comprises: a) a bottom and one or more base sidewalls, each of which base sidewalls comprises an exterior sidewall surface and an interior sidewall surface, wherein each of which base sidewalls comprise one or more buttresses, wherein the one or more buttresses are bossed, project from an exterior sidewall surface and are of single-walled construction, and wherein the bottom and the one or more base sidewalls are of single-walled construction; and b) one or more posts, each comprising a post inner wall, a post outer wall, and a void between the post inner wall and the post outer wall; which base is configured for use in an automated liquid dispensing device; and a) a bottom and one or more base sidewalls, each of which base sidewalls comprises an exterior sidewall surface and an interior sidewall surface, wherein each of which base sidewalls comprise one or more buttresses, wherein the one or more buttresses are bossed, project from an exterior sidewall surface and are of single-walled construction, and wherein the bottom and the one or more base sidewalls are of single-walled construction; and wherein each of which base sidewalls comprise one or more buttresses, wherein the one or more buttresses are bossed, project from an exterior sidewall surface and are of single-walled construction, and wherein the bottom and the one or more base sidewalls are of single-walled construction; and b) one or more posts, each comprising a post inner wall, a post outer wall, and a void between the post inner wall and the post outer wall; (ii) wherein the pipette tip rack tray comprises: a plate, tray sidewalls and a tray flange; which plate comprises a proximal plate surface, a distal plate surface, and a plurality of plate bores; each of which plate bores is configured to receive a pipette tip; which tray sidewalls project from the distal plate surface; and which tray flange extends from one or more of the tray sidewalls and comprises a proximal ledge and a distal rim. a plate, tray sidewalls and a tray flange; which plate comprises a proximal plate surface, a distal plate surface, and a plurality of plate bores; each of which plate bores is configured to receive a pipette tip; which tray sidewalls project from the distal plate surface; and which tray flange extends from one or more of the tray sidewalls and comprises a proximal ledge and a distal rim. <EOS>