These are "Upper Half Only" door Seal for the Snapmaker J1s printer.

They are designed to be printed from TPU and purposely only the upper half because the printer airflow requirements are such that severe overheating may occur is the door is completely sealed. These simply slip onto the door glass under tension (no adhesive required).

My printer is in a Cold climate and had troubles keeping warm enough with some of the higher temp filaments... Works Great with ABS, PETG,PA, PACF etc.

I designed these as well as the Upper Lid Extender and the Internal Spool Holders (also in Thingie Files) and all have been in service for more that 1,000 hours of print time with No Issues.