Within one embodiment, a voltage detector circuit detects whether a voltage supply is in a high or low range and generates a logic output. The fishing weight includes a dive-inducing member constructed to dive through water, and dive-stop structure in communication with the dive-inducing member and the fishing line, and being actuable by a force exerted along the fishing line to stop the fishing weight from diving. The device has the particular advantage that layers of material can be applied without any loss of material and is particularly applicable in a laser sintering device. A tool retaining insert is permanently secured in the cavity.