These are braces for the modular skadis panels meant for https://www.prusaprinters.org/prints/19442-modular-skadis-panel
These will be used to piece together the above panels to form a big wide panels according to your liking.
You need to print at least 2 of each item for front and back side to ensure that the panels will stay flat together, then screw them together with any M3 paired with nylon nut or locknuts
For printing the diagonals, just mirror the other one to ensure they are matched front and back
This script are now considered obsolete/old. However, this script is still usable lacking few features implemented in the latest one at the link above. This script still compatible with the new ones, don't worry.
The author hasn't provided the model origin yet.