These models are various Brackets for the Carvera and the Carvera Air. There are normal ones that are similar to the one that comes with the CNC. There are ones that are close to the normal ones, but the holes are chamfered instead of having a sunken hole. Lastly, but most importantly there are ones that holds the PCBs in the air.
PCB holders are still in "beta"
The author marked this model as their own original creation.