The Snapmaker U1 has some fairly large vent holes in it's floor, and I noticed that plastic bits shed through printing, purge lines, etc could easily fall through. I don't really know how big a problem that is, but it's not something that I want to happen, so I designed these snap-in mesh inserts to help prevent objects from falling through while retaining good airflow. 

There are two of these hexagon grilles in the floor, and they are the same size so this model will work for both. A 3MF file for Orca Slicer's U1 Profile is included in the raw model files. 

Print these out of a material that can withstand the heat of your print chamber. PLA is probably fine without an enclosure, but PETG at a minimum should be used if your U1 is enclosed to prevent it from warping and possibly getting stuck in place.