My dust boot sm is tightened down but rubs on the z axis frame. When I line up the bottom of the boot to the frame, there’s no clearance. I can’t fit a thin sheet of paper through there. It rubs and is leaving marks. This can’t be good long term, no?
I had it happen to me, but I found that when I installed the z slider, I got interrupted and when I came back a had forgotten to install the top two bolts and the spindle was leaning forward and that was why my SM dust boot was hitting on the z. Assuming you did not do that also, check to see that the screws are tight and it is not leaning forward for some other reason.
no I meant the z slider. the mount for the Spindle. it has 4 bolts and i neglected to install the top two. when I corrected that the dust boot no longer hit.
Oh yeah. I just checked my entire Z assembly and it looks like everything’s tight. I’m guessing my boot or z assembly is just a little out of spec if others are only seeing a .025" gap.
The clearance is definitely very small. One thing to watch out for is the top dust shoe attachment being/remaining perpendicular to the spindle body.
With heavy unsupported dust hoses - not suggesting this is the case with any users - it may push the bottom back of the dust shoe closer to the Z assembly bottom bracket. This would be magnified with 4" dust extraction systems and situations where the dust shoe is clamped very low on the spindle body (not engaged as much on the 80 mm portion).
I have the same issue and it actually popped off running a job. To “fix” I lift up on the front end before tightening my shcs (I didn’t get a fancy thumb screw so had to get a bolt out of my junk bin.). I also wrapped a piece of duct tape around the front end to keep it together as insurance.
Yeah, just happened to me, should have seen it coming. Was working in the background and heard a lot of unusual noise from the cnc. Looks like the bottom was shoved off by the z bracket. On closer inspection, the bit mangled the lower half, cutting and melting parts of it and trashed the brush. The bottom half doesnt attach anymore 
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You might look at Francis Creations auto dust boot to avoid this.
Pat
@Captain Did you end up moving to a different dust boot? I just had this happen as well.
I did. My boot was damaged after it got pushed off and wouldnt fit back on. Even if i could get it back on, I wouldn’t want to use it because I couldn’t trust it.
I got a new 3d printer and decided to just print out a different design.
I say this with respect Onefinity because I do love my machine and have spent a lot of money on your products. But I think you should reconsider selling this dust shoe or at least updating the design. With the clearances other people are reporting, I cant imagine this not being a very common problem. I got very little usage out of this shoe before it failed catastrophically.
Just wondering if anyone found a fix or solution for this? I just got mine and it is really bad hanging over.
I reached out to Onefinity Supports email and sent them a video. I have a gen 1 elite with a z20 slider. There are two versions of the Z20 slider a newer bottom plate was provided to me which now has plenty of room for the SM dust boot.