Copy/pasted the description from the original author:

"I designed this piece to mount IKEA SKÅDIS boards onto a wall using regular screws. The board does come with screws and a mounting bracket, but I was looking for a more flexible solution: with this adapter you can mount the board on several points if you want more strength or rigidity, and you can choose at what distance you want the board from the wall by adding a spacer.

The diameter of the hole for the screw is 5 mm, limited by the width of the holes in the SKÅDIS board. This is therefore also the maximum diameter for the screw you can use."

I printed with 100% infill, to make sure that the screw could not compress the piece.

10mm set:

Layers: 50
Model size: 79.75mm × 128.75mm × 10.00mm
Used filament: 3.39 gram
Filament: 1.08m / 2.60cm³
Filament cost: €0,08 per set (based on €25,- per 1kg of filament)
Estimated print time: 00:20:46 (hh:mm:ss)

20mm set:

Layers: 100
Model size: 79.75mm × 128.75mm × 20.00mm
Used filament: 5.35 gram
Filament: 1.71m / 4.10cm³
Filament cost: €0,13 per set (based on €25,- per 1kg of filament)
Estimated print time: 00:32:38 (hh:mm:ss)

I will try to monitor the comments, if you want any other size, just leave a comment and I will make it for you.