Dual hot-end adaptor.
thingiverse
These two parts, designed in Tinkercad, convert a standard Reprap with an X-carriage extruder into a dual hot-end printer. The T-shape attaches where the hot-end would on the extruder, while the larger part bolts onto the X-carriage, holding up to two hot-ends. To install, unbolt your current hot-end and extruder, connect the parts with M5-nutted PTFE tubes, bolt the large part to the X-carriage, and attach the T-shape to the extruder. Then, add an additional extruder and T-shape for a second hot-end on your printer. Print instructions available at https://tinkercad.com/things/fsba2cAItSM.
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