The Snapmaker J1 came with some nice tools, but no where to put them. so I whipped this up real quick. Mounts on the left side of the printer. Have to remove two of the M3x6 screws on top. replace the m3x6 with two m3x10 screw to mount. used custom supports on the large opening, so during bridging the filament doesn't droop down too far. add a 2nd one that puts the metal brush in the rear. Update the the model. I added a second one for the bottom, has places to store extra nozzles, glue, cutters, and a small tool tray for screws.