In the furniture industry we always used “Silbergleit” which does not leaf marks or stains on wood. I have bought some but haven’t tried it on the Maslow yet. It can be expensive but it really works good and you only need very little. Normally it is used on metal surfaces of jointers and such wood processing machines, but like I said I have not tried it on my (plastic) Maslow yet. I will post when I have tried it, but I am sure it will work. Other wax or oil should also work but might make stains on porous materials that you can never get out again. I haven’t tried it yet because I first want to try making my anchor points, each at the level of their own arm, so all belts are parallel to the work surface. So I can see the difference with the normal configuration where I also got the lifting effect. Haven’t found time yet to do the next experiment.