This is a simple AMS spacer shim that fits on the lid for those with the AMS ontop of their printer to lower humidity while printing.

The reason is while printing the heat from the bed and extra led light strip rises into the AMS and with this shim allows the humidity to escape which is the same practice that the Sovol SH01 filament dryer and others use where you prop the lid open slightly when drying to let moisture escape.

My AMS humidity without dessicant (I will be getting some) went from a 4 to 1 with the lid propped slightly open on a multi hour print, without propping the lid up would stay the same humidity all print.

This can also help those with reusable colour change dessicant tubs in the AMS to keep them lasting longer bertween drying sessions.

Mine was printed in PETG at 0.16 Quality layer height.