MMU2S PTFE Tube Direction
When building my MMU2S the directions said that when inserting the PTFE tubes between the bondtech gears, and the selector that the chamfered end of the PTFE tubes should be pointing out, but I found that loading is much smoother when the chamfered end is pointed in towards the bondtech gears. Has anyone else found this to be true, and is it possible that the assembly instructions are incorrect?
RE: MMU2S PTFE Tube Direction
I read this in the instructions, I do believe that the person who designed it believes that this is correct, however I have found that yes it is easier to load with the chamfered end going in not out. However in the end I replaced the PTFE tubes with larger inner diameter tubes.
RE: MMU2S PTFE Tube Direction
@magician-144
Thanks. What diameter tube did you go with?
RE: MMU2S PTFE Tube Direction
Crazy idea... chamfer both ends XD The brad point of a 10-12mm wood drill bit works well.
I suspect the intent is that the end facing out is more likely to need to receive a "fat" filament tip and so is chamfered to reduce the odds of it catching on retract. OTOH if you're loading filament from the rear, odds are you've just cut the end fresh and so this is less of an issue.
RE: MMU2S PTFE Tube Direction
@alamatth
I used 2.6 ID and 4 OD tubing thatI found on Amazon.
RE: MMU2S PTFE Tube Direction
Crazy idea... chamfer both ends XD The brad point of a 10-12mm wood drill bit works well.
I suspect the intent is that the end facing out is more likely to need to receive a "fat" filament tip and so is chamfered to reduce the odds of it catching on retract. OTOH if you're loading filament from the rear, odds are you've just cut the end fresh and so this is less of an issue.
An alternative tool you can use to chamfer the tubes is an RC hobby tool like this. Saw it recommended somewhere on YT. I've used it for months, works awesome. Just wanted to pass that info along.
RE: MMU2S PTFE Tube Direction
@nimaim
I actually have one of those for RC car bodies. Thanks!!
RE: MMU2S PTFE Tube Direction
@magician-144
2.5mm ID isn’t available anywhere in the US. Do you think 3.0mm ID would be too wide?