This is a removable 150mm x 130mm tray that attaches to the Extension Collar Assembly on the Park Tool PCS-10 bicycle work stand using two 3/8" bolts or pins (or M9).
The tray extension in the front can hold two 12mm thru axles or one 15mm axle, and various hex wrenches, screwdrivers, etc.
NOTES:
The mount sits on top of the extension collar, which as the main tube leans forward, slopes at 15 degrees up to make the tray level. Turns on supports for this part of the print.
The author marked this model as their own original creation.