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nicholas.seward
@brandonh: Added the branch. Great idea. I am new to source management. [github.com] I will merge it once we can verify that it doesn't cause any problems.
Thanks! Looks good here. Let me know if you have any Git/GitHub questions. I'm sure you'll be seeing Simpson pull requests shortly.
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nicholas.seward
The string goes from the pulley around a motor/slave bolt pair and then around the back edge and to a spring or the tuner. Sorry no pictures yet. I have the switch over in my queue. :-)
Got it. If you or owens can post a quick wrap video, that'd be great; when wiring the Legacy Kossel a year ago, I found a video extremely useful and so much better than any text or diagram.
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nicholas.seward
Taper the end of the PTFE tube and then thread a M4 nut directly on. I have yet to test it myself but owens assures me that it is super strong as in it can't be pulled off by hand. Try it out and let me know. I opted to not go for the pressfits because they are a specialty item and I figure I already exceeded my quota with the tuning pegs. I originally had a pressure cone. That worked but if you over tighten the cone decreased the ID of the tube and added drag.
I just realized I probably should make the BOWDEN NUT taller so it can keep the tube perpendicular to the nut. I will test this soon. No need to optimize unless there is a problem.
Right, but then you've got to thread an m4 nut on slippery PTFE for 3 full inches, which seems like a bit of extra effort. If the nut was at the bottom of Hub Bottom, next to the hotend, and inserted first, you could eliminate the Bowden nut entirely, as well as chop 20 mm of plastic off of this part. Yes, you might need to thicken Hub Bottom to do that, and yes, it might be harder to remove the tube.
Also, seems odd to have a 5mm diameter hole through Hub Bottom for a 4mm OD tube. This seems too tight for a 3mm-capable PTFE and too loose for the specified 4mm/2mm PTFE tube. If this was a loose slip fit for the 4mm tube - something like 4.2mm - then you could insert a carefully sized piece of PTFE into the hole in Hub Bottom, lock it down with the nut screwed onto the main-length PTFE, and avoid the 3-inch threading. Without this I doubt the filament would necessarily find its way in. When your hole _to_ a pushfit (or other PTFE tube) is larger than the push fit's hole, I find the filament does just this - get stuck on the lip - making loading frustrating.
Random note to other forum users looking to mod the GUS parts: if you're using 32-bit windows, the GUS Inventor files can quickly use up the default 2GB per-app Windows max, and then Inventor complains about being low on VM and/or freezes. Making the change to "3GB mode" made a huge difference, and now Inventor no longer complains about being low on virtual memory. Plus, I didn't need to upgrade to 64-bit windows to get more memory available.