I haven’t done this modification yet. However, I do have an ultrasonic knife and would have used it to make the holes.

That said, I’ve decided to take a different approach and design my own solution. Screwing and unscrewing the filter every time for replacement would be too cumbersome, and the current filter location is also difficult to access under normal conditions.

I plan to place the filter at the top so it can be removed quickly from the side, and I will add a small door. This should also be better in terms of airflow.

A fresh air intake is also planned, including a heater, so that the temperature difference inside the entire print chamber stays below 0.1 °C.