We are working on the LEGO®-compatible Marble Run building blocks / bricks for up to 12 mm balls. But sometimes it helps to have a few specialty parts for curves, gentle slopes and smooth transitions.
LEGO® bricks shown in the build examples are not part of the set. LEGO® is a trademark of the LEGO Group of companies which does not sponsor, authorize or endorse this site.
Here is a list of the actual building bricks:
download the STL files of the Marble Bricks under :