Maintaining optics (Form 2 vs Form 3)

You are welcome.
Another fantastic tool to maintain the Form 2 in good shape if the Arctic butterfly from VisibleDust in Canada:

https://visibledust.com/products/arctic-butterfly-724s-super-bright-sensor-brush-for-cleaning-sensor-of-digital-cameras/

It is a static electricity brush that allows to clean the window and mirrors in seconds.

Another bit of advice, is to use flexible tape ( 3M blenderm is really good for this ) to close the printer joints around the front enclosure.