Abstract: A user feedback system for a user of a delivery device within a delivery ecosystem includes an obtaining processor adapted to obtain one or more user factors indicative of a state of the user, and an estimation processor adapted to identify a one-step or two-step correspondence between the obtained one or more user factors indicative of user state and at least a first feedback action, the feedback action being expected to alter a state of the user as indicated at least in part by the one or more user factors.

Abstract: A user feedback system for a user of a delivery device within a delivery ecosystem includes an obtaining processor adapted to obtain one or more user factors indicative of a state of the user, wherein the one or more user factors are based upon at least a first aspect of a situation of the user separate to a handling or operation of the delivery device by the user; and an estimation processor adapted to identify a corresponding feedback action expected to alter a state of the user as indicated at least in part by the or each user factor.

Abstract: A sealed type light curing 3D printer and a method using the same are provided. The 3D printer includes a reservoir; a microcontroller; a plunger for creating a sealed space between itself and a bottom of the reservoir by disposing in the reservoir; a printing platform releasably disposed on a bottom of the plunger wherein a bottom of the printing platform is flush with the bottom of the plunger; an illumination unit under the reservoir; a liquid material tank communicating with the reservoir; and a gas tank communicating with the reservoir. Both the plunger and the printing platform lift a first distance to draw liquid material into the reservoir. The plunger further lifts a second distance to draw gas into the reservoir.

Abstract: A sealed type light curing 3D printer and a method using the same are provided. The 3D printer includes a reservoir; a microcontroller; a plunger for creating a sealed space between itself and a bottom of the reservoir by disposing in the reservoir; a printing platform releasably disposed on a bottom of the plunger wherein a bottom of the printing platform is flush with the bottom of the plunger; an illumination unit under the reservoir; a liquid material tank communicating with the reservoir; and a gas tank communicating with the reservoir. Both the plunger and the printing platform lift a first distance to draw liquid material into the reservoir. The plunger further lifts a second distance to draw gas into the reservoir.

Abstract: A filtration mask has a collapsible air guide and two filter supports connected at a hinge. The filter supports are movable between a storage position and a deployment position in which the angle between the filter supports being less in the deployment position than in the storage position. In an aspect of this invention, the filter support each have a recess at the hinging edge, and an exhale valve communicating with the air guide is mounted in the recess. In another aspect the exhale valve is connected to the filter supports by a flexible membrane. In a third aspect the air guide is formed by hinged panels.