Plug - Pneumatic - Closure

This plug serves to easily close connections, such as those present in many printers for the PTFE tube. With it, dry boxes or unused connections on the printer can be closed quickly and easily. 

According to the drawing, it has a diameter of 4.2 mm on the pin that is inserted into the connection. When printed from PETG/PLA and with the connections I have, such as the coupler and the 4-in-1 adapter from Bambu, as well as some pneumatic connections, it could be inserted and removed wonderfully. Adjustments via scaling may, of course, be necessary for you. After completion, the print only has a diameter of approximately 4.1 mm, which should also be the case for most after that.

I printed this from PETG and also with PLA at 0.16 mm layer height and solid infill. For functional parts, however, I always recommend PETG. The length is personally necessary for me to make handling it easier to attach and detach. 
 

If you don't have good adhesion on your print bed here, you should use a brim. This can be found under [Miscellaneous »» Print Bed Adhesion »» Skirt/Brim Type »» Outer Brim Only]. When activated, the small head is still surrounded by a few lines.

Caution: I do not recommend using this for pressurized lines. For me, there is simply a technical difference whether you have a truly smooth surface from an injection molding process or a slightly ribbed one, as is the case with 3D printing. However, this is my purely personal opinion on the matter. The purpose here for me is solely to close various openings in the 3D printing area. However, I tested these plugs with a named manufacturer of pneumatic connectors at 8 bar pressure and experienced no movement of the plug or pressure loss over a test period of 24 hours.