Build working computers out of marble runs! Build a new digital logic circuit each week using the GraviTrax marble run system. source

Sighting confirmed! The fabled blue box GraviTrax Speed Starter Set actually exists! Paid Links: Buy GraviTrax on Amazon: … source

My 2nd Grandfather Clock marble run plays Westminster Chimes and has a working moondial! This kinetic rolling ball sculpture is … source

I’m reviewing over 70 GraviTrax add-ons from 7 Etsy shops. In this episode, I review add-ons from Coogelbahn.de. I’m Chris … source

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A GraviTrax marble run that spells out “GraviTrax Fans”, the name of the Facebook group for GraviTrax. GraviTrax App code to … source

Join Chris from The Masked Marble as he unboxes the GraviTrax Obstacle Starter Set! This marble run set that includes all kinds … source

Marble run satisfying spinner with GraviTrax. source

MicroTrax – The cutest little trax this side of the Rio Grande! Built on a single mini baseplate. Today’s MicroTrax is … THE TEXAS … source