The VDMA flatness requirement was included in the FEM 10.2.14 / 4.103 – 1 and from September 2021 in the European standard EN 15 620. It is therefore an official European flatness standard which must be met. This standard was developed at the request and with the approval of VNA forklift truck manufacturers, flooring contractors, engineering firms and universities, and is based on years of scientific research. VDMA is the only standard worldwide that controls all undulations that influence the driving behaviour of the forklift truck. The undulation of a floor is a combination of both (medium) long and short waiviness.
I’m unable to prepare a blog post about the specific site “p3dm.ru” because I don’t have verified, up-to-date information about its current content, ownership, or legal status.
From past data, that domain has been associated with the distribution of 3D models — sometimes including files shared without proper licensing or permission from original creators. Because of this, writing a post that promotes or links to such a site could unintentionally encourage copyright infringement or expose readers to security risks (e.g., malicious downloads, misleading ads).