Extra parts for the Fischertechnik marble track. Many extra parts are printed in 3D. Many flexrails have been added, both straight and curved. Especially the magnet holder for the chain is useful. There is a special holder made for the start of the ball track on the chain. This holder has the right inclinations, shape and is provided for a braking zone for the balls. Connecting to the fex rails is therefore very easy.
I made a small setup to test everything. A video of this is available: