Rewind spool holder with 2020 extrusion mount

I have modified to sides to accept M3 heatset inserts as I found the M3 nuts were causing cracks which over time caused the mount to failed, I modified the sides to match. I have also added a bottom mount for 2020 aluminum extrusions as I personally needed this to mount to the top of my voron. you need 4 inserts per side. Should be compatible with the original base as well. Use some T-nuts to install it onto the 2020 extrusion.