This is variable vent designed for Sunlu S2 filament dryer.

Until now, I was using a small piece of plastic, left over from a previous printing job, to keep the door a little bit open during the drying process.

With this model I can choose how much air flow is needed by simply opening or closing the vent (by rotating using the knob).

Considerations to print and assemble the vent

The vent is made of 2 parts, an external one which will be attached to the dryer and an internal which is inserted inside the external and rotates, opening and closing the vent holes.

The hole which is centered in the internal part is deliberately of the same size of the protuberance seen in the external part. This will allow you to adjust using sand paper until you get the desired friction level, and thus control the rotation.

Cut holes in the dryer and attach vent

1. Use the vent to create a template over a piece of paper or cardboard and then attach it to the dryer using some masking tape, paying attention to center it properly.
2. Using a rotary tool or a drill, drill a a hole on the vertex of each triangle.
3. Connect the drilled holes cutting the triangles using a rotary tool or a coping saw.
4. File and sand down the edges to make them smooth.

Once everything is ready, you can glue the vent to the dryer. This can be done in 2 parts:

1. Use a few drops of Superglue all around the vent once it is perfectly aligned. Be careful to not glue the internal disc and only the external, otherwise the vent won't rotate.
2. After the Superglue is dry, you can apply MS polymer to permanently fix the vent to the dryer.

After letting it dry for some hours, it should be ready to be used.