My Ikea Pax sliding closet is already over 10 years old now, but it should be no excuse not to do its job anymore.
But the height adjustment did not work properly and eventually one of the two doors felt out of the closet onto my TV. The reason was, the adjustment system was very poorly designed – (very tiny plastic teeth hold a 20kg door in its position, Ikea: why????)
Ikea was not very helpful, they did not provide a replacement part. So I designed my own fix.
You can find it here: https://www.thingiverse.com/thing:4154638