The corners can be either clipped on or secured with M3-0.5 x 20 mm socket head machine screws. I have them secured. If you decide to secure them, you need to buy the screws, but no new screw holes are necessary: the screws will use existing holes and nuts. The front piece is optional and it has to be secured.

These were inspired by Baron Williams, but this is not a remix of his version: https://www.thingiverse.com/thing:667599

If you have an older FlashForge Dreamer with a “frosted” front door and no rear case fans, you will get better fitment using his version. For a newer Dreamer with a clear front door, mine should fit better.

How I Printed:

Notice the springs at the bottom of the corners: support is needed for the layers above the voids.

CAD Link:

https://cad.onshape.com/documents/24d41c66a8850a987ad6195c/w/83e1f9401c76d9df61478062/e/0a3c7320fbae1dd719b7f8e4