This is a butt to prevent the bookshelf from falling over when it is installed.

Use it in these situations.
When you want to build a bookshelf up to the ceiling with 2×4 lumber but it is unstable and you cannot use screws on the wall.

To use this, the following steps are required
1: After printing the data, you need to combine M10 bolts and nuts (2 pcs) with it, and washers. (The side inscribed with "A" will be on the back side of the unit.)
2: You need to dig a 12 mm hole at the top of the top of the part that will be the pillar on the side of the bookcase.

Note: This item must be placed with the "A" engraved on the back side to avoid the skirting board near the ceiling.
To avoid the skirting board, the bolt insertion point for this item is slightly off-center.

Finally, use this item at your own risk.

XYZprinting

da Vinci 1.0 Pro 3in1

Doesn't Matter

Yes