I made a new bracket because I wanted a split design; it means less long full surfaces and so less bowing, as well as a bit more tolerance as it does not depend on the cross-bar being the correct width and not shrinking.
It is a little tough to get the screws in, but computer screws usually have hexagonal heads, so it is quite easy to use pliers if it is too tough with fingers.
As always, I recommend testing the holes with the screws first, and if it is too difficult, pre-drill your holes by spinning the bit fast in reverse and using the heat to smooth out the holes.
I only made it with the side-screw holes, I will be making more with the under-mount and dual side and under mount options. The current versions are side-mount only (requires no supports), and side mount with an under-bracket to hold it up (you can use less screws), but it requires supports in the print.
supports required for v3, but not v2
smothing out holes
test the screw holes and if needed, smooth them out with rapidly spinning drill bit with little to no pressure to use the heat rather than the blades (use it in reverse to avoid snagging)