If you want to isolate your heated bed with silicon wool, you will notice that this stuff doesnt adhere well to the common 3M strips or the likes; it will just peel itself off.
So, since we already have kind of an underconstruction to just put the silicon wool between this and the heated bed, i just needed something to put some support in the middle.

I designed this for the standard Cube Anet A8 Construction, but i think its also fitting for the standard Hypercube Evolution.

I measured 140mm in length, and so i designed this to be a tad longer (142mm i think), so
it presses the wool a tad up.
If you have an underconstruction of another size, just measure that out, and scale that up in the cad of your choice.

Print instructions

Category: 3D Printer Parts Print Settings

Printer: CubeAnet A8

Rafts: No

Supports: No

Resolution: 0.3

Infill: 15%

Filament: Owl Filament PETG Red
Notes:

The Filament isnt good, but for functional prints like that its good enough.