The file 'Filament Joiner 3D Printer Model' is (stl) file type, size is 27.5KB.
New design. Weld the knurled knobs onto 4mm screw/bolt. Snap square nuts into the bottom part - superglue them in. I used a couple of 14mm bolts that came as extras with my Prusa Mk3s.
Screw the filament ends tight and hold the gap over a tealight or candle flame. Squish the ends together until cool (or hold the device legs together with clothes peg or similar). Open the device arms and trim the squashed bulge - sand smooth.
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fillament_joiner.stl | 114.5KB |