During my attempts to increase the chamber temperature, i noticed that there were small gaps all over the tophat, allowing warm air to escape.
To reduce this I have designed a small block onto which 8mm wide self-adhesive foam strips can be glued. The block is slightly beveled, which makes it easier to close the tophat and also provides a good sealing.
There are 2 versions :
For reference - these are the foam stripes I used. 8mm wide and ~1mm thick (leftover from Formbot kit), just glue them into the groove on the side :
The author marked this model as their own original creation.