spherical port inner with restricted ptfe bore exit
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prevents the PTFE from fully passing through. the blocked side is chamfered to allow easy filament feeding into the tube
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In the original design the PTFE tube can be fully passed through the part. If this is not desired for any reason, the remixed part is designed to prevent this by narrowing the exit, just enough to block the tube but not the filament at the center.
- One side of the inner race (inner ring for spherical bearing) has a restricted bore exit to prevent the PTFE tube from fully passing through. This exit hole is 2.3mm, does not obstruct the 1.9-2.0mm ID of the PTFE tube but fully blocks the 4mm OD tube.
- The restricted exit hole is also chamfered on that end, creating a funnel directly to the center of the PTFE tube to aid in manual filament feeding. The widest point of the funnel is just over 4.6mm diameter. Not a big aid but it mitigates the problem of trying to blind feed a 1.75mm filament into a 4mm tube that has a flat cut face.
The attached 3mf contains the inner & outer. The outer is unchanged but it is included because you have to print both in place. The nut is unchanged and can be downloaded from the original design. If you want to change the ptfeBoreExit hole parameter from the provided 2.3mm, you can do so with this modified copy of the original OnShape worksheet:
I tried my best to make sure my modifications don't interfere with the other aspects and parameters of the original design so all of those should continue to work (within reason of course).