Abstract: Apparatus and associated methods relate to a thermal runaway protection circuit (TRPC). In an illustrative example, the TRPC may include a state controller, a temperature sensor input to the state controller, a power output operated by the state controller to selectively provide power to a heater element, and at least one visual indicating element operated by the state controller. The state controller, for example, may activate the power output and a first predetermined indication of the at least one visual indicating element in response to the temperature input being less than a first predetermined temperature threshold. When the power output is activated, the state controller, for example, may disable the power output and deactivate the first predetermined indication, in response to the temperature sensor input rising above the first predetermined temperature threshold. Various embodiments may advantageously interlock the power to the heating element based on the temperature sensor.

Abstract: Apparatus and associated methods relate to a filament dispensing dry box defining a cavity sealed from ambient atmosphere external to the dry box, the cavity being configured to receive at least one spool of filament for deposition. In an illustrative example, the cavity may be provided with at least one replaceable desiccant cartridge. The cavity may, for example, be defined by a lid, hingedly coupled to a base. The cavity may be sealed, for example, by a sealing element between the lid and the base. The cavity may, for example, have a filament egress aperture configured to slidingly seal to the filament. The cavity may have, for example, a lumen through the lid and the base configured to slidingly receive a spindle for supporting the dry box. Various embodiments may advantageously dispense filament from a dry environment.