Don't do it - Hot end

thingiverse

This dangerous contraption has several issues: it lacks scientific basis and poses risks of electrical failure, health hazards from fumes, low mass design, and incorrect thermistor placement. Consequently, it requires a high working temperature and may leak toxic fumes. Despite these concerns, the creator has noticed increased interest in the project online but advises against it. After nearly eight months of use without issues, the hot end ultimately failed due to an incorrect temperature setting causing components to melt together. The creator's MK4 model had more downtime for repairs than actual operation. Therefore, potential users should avoid this design and its associated risks.