and aluminum was used for the upper portion because it has a much better thermal conductivity

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All metal hotend solves this problem

TMC2100 Low Noise Stepper Driver (Uden Køleprofil) Smådele and aluminum was used forTMC2100 silent step stick (Without cooling profile) This is the most silent step stick. Typically used on X Y axis (not Z E) The TMC2100 is a single axis stepper motor control and driver IC, unique in both its quality and extreme simplicity regarding both use and setup. The new stepper motor features: Integrated MOSFETs to drive RMS motor current to 1. 2A Configuration via seven pins on the driver IC No required intervention by host CPU Up to 256