OF1010 Extra Collet

[RKA]

It most definitely is an 8.  I measured it at 7.84mm ID. 

Update in case anyone stumbles on this, Festool was kind enough to mail a new collet out rather than having me ship the tool back.  The new collet works as expected.  The ID of the new collet is roughly 0.1mm larger that the collet I was having issues with.  Never encountered an out of spec collet before, but I guess it can happen.

 

[sprior]

I designed and just posted to Thingiverse a design for a 3D printed holder for the extra collet - you'd drill a 1/2" hole in an open spot on the insert and install this piece with the printed nut that comes with it.  Then you can easily thread the extra collet on/off, I designed it to be an easy loose fit so it won't be fiddly.  I printed one and tested the fit, but haven't installed it yet.