Abstract: An amount of material in a container is determined by measuring a time it takes for an object to move through the material, and determining the amount of material based on the measured time.

Abstract: A cartridge for a printing device includes first and second portions coupled to one another and capable of moving relative to each other, one or more rollers situated at the first portion, a photoconductor situated at the second portion, and a lock mechanism. The rollers are in contact with the photoconductor in a first position of the first and the second portions. The lock mechanism maintains the first and the second portions in a second position in which the rollers are separated from the photoconductor.

Abstract: In one embodiment, an adhesive pattern comprises a length of releasable adhesive defining an elongated generally rectangular perimeter having tapered ends. In another embodiment, an adhesive pattern comprises an endless loop of releasable adhesive defining an elongated generally rectangular perimeter having tapered ends.

Abstract: In one embodiment, an article comprises a spacer configured to increase a dimension of only a portion of a guide part on a print cartridge when the spacer is fastened to the guide part and a fastener allowing the spacer to be removably fastened to the guide part.