Ultrasonic filament splicer

thingiverse

Ultrasonic welding is an efficient method for splicing plastic filaments, offering several advantages over traditional techniques. The ideal ultrasonic welder operates within a frequency range of 15-70 kHz, often found in common household items like ultrasonic cleaners and humidifiers. One possible option is the Harbor Freight's handheld, battery-powered "Ultrasonic Stain Cleaner" (model #96474). By disassembling it and connecting it to a 0-18V bench power supply, filament welding can be achieved in just half a second. However, care must be taken when using ultrasonic transducers, as they are delicate and require proper support. A simple jig, spring clamps, and a 1.75mm notch filed into the transducer's horn help ensure a strong, homogenous weld that is often stronger than the filament itself.