2/28/19 - Added a taller version that uses a drop in t-nut as well.
Added a shorter version that uses a drop in t-nut.
If you didn't add a drop in t-nut during the build and don't feel like taking things apart, just use one of these: https://www.thingiverse.com/thing:256124
I recently upgraded my Prusa MK2s to the 'full' Bear upgrade by pekitron (https://www.thingiverse.com/thing:2808408).
I use the original of this on my MIK2s, but it wouldn't fit on the new extrusions. So I chopped the bottom off, added the v-slot attachment. Insert and twist.
I used 10%, use whatever you want
Supports are required for the non-t nut version. (ie the twist in version)
This doesn't have to be printed to be very robust as there are no forces acting on it. I did my usual 3 perimeters, 3 top/bottom layers using black PLA.