Rostock Bowden (hotend) Push-Fit Connector
thingiverse
The bowden tube repeatedly loosened, so I purchased push fit connectors from Grainger (part# KQ2H04-01AS) with a 4mm od 1/8 thread. The hotend connector's threads provided a snug fit. Grainger's url: http://www.grainger.com/Grainger/wwg/search.shtml?searchQuery=36w998&op=search&Ntt=36w998&N=0&GlobalSearch=true&sst=subset. I printed an ABS model with 35% infill, two extra shells, and a slow speed of 35mm/s for optimal results; the connector came pre-taped with teflon for ease of installation.
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