Qidi Avatar IV - heat chamber

Printing ABS works best using a heat chamber, and while the Qidi Avatar IV has a top cover there's still very much air flow. Adding an extra cover will keep the heat inside. Warning: This might cause overheat damaging the printer (electronics, motors, belts). But for energy-conserving and warp-free printing you might ignore the risks, there's also much less odor.
There are still gaps that allow air to circulate,  the original cover isn't air-tight anyway.

Here's what it looks like:

Heat chamber

Detail view of one side

The files are on github. The chamber consists of two sides, plus a copier transparency all glued together and then glued to the original cover using casein glue/wood glue.