Printed the 30mm file on my MK4 in PLA on the default .05 layer height settings with 15% gyroid infill. (.01 because I wanted them as smooth as possible) Everything looks good. These seems to be a few blemishes on the top of the corners but nothing that I would call a failure. (edited)
Took a while to print but it's larger than I expected. I wasn't sure if it would be big enough to fit the whole hose but there's plenty of room! Love the slots at the bottom to hang nozzles!