printable brace for neptune 3 printer, uses 8mm threaded steel rod and nuts (available B and Q in the UK) .
has variants to fit cable chains and klipper mounts as follows -

neptune brace topr - brace top component
neptune brace klipper - front right anchor with rail to mount pi and display as per https://www.thingiverse.com/thing:7080386
neptune brace cable chain - rear left anchor with fittings for cable chain as per https://www.thingiverse.com/thing:5521311
neptune brace basic - generic anchor (can be mirrored for front back left or right)
neptune brace backright - anchor with some extensions to make it easier to print

these were generally printed in such a way that minimized supports by printing overhangs with 45deg angles
the exceptions being the cable chain - if you wish to use this you will need to have an upgraded direct drive extruder as the stock one and runout sensor will foul the brace
and the basic as without modifications its very hard to get good accuracy in the hole the rod fits in - i have included it more for if people want to remix

Does this make the printer 'stiffer' .... marginally i expect
Does it make a big difference ..... probably not
Does it make the printer look cool ..... also probably not
But i had fun