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Hi Art,Thank you very much, I'm glad you enjoyed it!At an average current draw of 50ma, the 800ma battery should run 16 hours before requiring a charge. However, being a LiPo with no low voltage protection, I charge mine after 8 hours using a LiPo balance charger available at hobby stores and online.Greg

Hi rizzocow,Thank you so very much, I'm glad you enjoyed it!Regarding the battery, I chose the LiPo architecture to avoid the safety circuitry as some times the Li-Ion protection circuitry will shut down the battery under quick / high current pulses. The LiPo battery I used is rated at 50C which allows it to delivery a much higher current short pulse than the battery is rated. The problem with using a LiPo battery is low voltage concerns.If you decide to try the battery you chose, please let me know your results!Thanks again!Greg

Thanks paulsfo!I believe that would be possible, quite an interesting thought!Greg

Thanks CarlosH53!Greg

Thank you maudibe, I'm glad you enjoyed it!Greg

Thank you darknician, I'm glad you enjoyed it!Greg

Thank you so very much M.C. Longer for your kind words, I'm glad you enjoyed it and you are very welcome!Greg

Hi jxrgen,Thank you so very much, I'm glad you enjoyed it, and you are very welcome!Greg

Hi ihart,Thank you! I'm glad you loved Marblevator, Wave, and I hope you enjoy this one as well!Greg

Hi Kdemon,Thank you very much, I'm glad you enjoyed it!I sold my company and retired 16 years ago (primarily to assist in taking care of my father suffering from advanced dementia). During my working years of designing flight control systems and software for aircraft (commercial, corporate and military) I had the wonderful opportunity to work with mechanical engineers and machinists who amazed me with their skills in designing and machining the gears, linkages, etc. required to deflect the flight control surfaces. So basically I learned by observation (such as in the conceptual models from Arglin Kampling [Third Gen] and thang010146 of a mechanical pick and place system I had seen years ago), asking questions, and making a lot of mistakes!Greg

Thank you very much ctstarkdesigns, I sincerely appreciate it!And you are very welcome!Greg

Thank very much Nirl, I'm glad you enjoyed it!Talent? Nah, just old!:)Greg

Thank you jegatheesan.soundarapandian, Im very glad you enjoyed it!Greg

Hi AussieAlf,Thank you, I've watched it too much so I'll just start a new design! :)Greg

Thank you PhilipJ1, I had a lot of fun with this one!Greg

Thank you very much JohnW51, I'm glad you enjoyed it!Greg

Thanks you very much jegatheesan.soundarapandian, I'm glad you enjoyed this model!Greg

Hi randofo!Many, many thanks, and thanks for the opportunity to publish on Instructables!Walk N' Roll!!!!!!! :)Greg

Hi rizzocow,Wow, just wow. And thank you for your kind words, they are inspirational!Greg

Hi rizzocow,Thank you, this one looks great as well!Greg

Hi rizzocow,Well, it looks great!Greg

Hi ChrisR278,Congratulations for you very beautiful results and skill! You are very welcome!Greg

Yes, the grandkids love drawing various tracks and trying them out! They draw them in different colors and add scenery.Greg

Hi wobbler,My thoughts exactly! Over 40 years ago someone thought about a crayon line tracing vehicle, then engineered the model. I guessed at some of the parameters, but it does work quite well!Greg

Hi wannabemadsci,You are very welcome, and thank you so much for your kind words! With the counter rotating front wheels, it will traverse the circle in either direction or follow a straight line. The area in which I video tape my models is quite small, thus the small circular track which, I might add, I was surprised the model would continuously follow!Thanks again, and you're welcome!Greg

Hi wannabemadsci,Unfortunately, I do not read the "fine print"! I was just about to contact Instructables and remove this model from the contest. You saved it!Greg

It's another beautiful success, congratulations !Greg

Hi ChrisR278,Now that's got me stumped. I'll go back and see if I can come up with an answer.Sorry about that!Greg

Thank you, I wanted to call them "inch worms" but the grandkids insisted on "caterpillars", so...:)Greg

Thanks randofo, I'm glad you enjoyed this model!Greg

Thanks Rob, it should read "M8 by 1.25".I need all the help I can get!Greg

Hi fdc313,I'm sorry but I do not, my version of Autodesk Fusion 360 is non-commercial thus I cannot sell nor allow anyone to sell my models.Greg

Hi rizzocow,You are your daughter working together is why I do this. Thank you so very much, I'm very happy now!Greg

Hi bruce.wassell,That is absolutely stunningly beautiful, congratulations !Greg

Hi rizzocow!Wow, nice work and looks great, congratulations!Greg

Looking good MarkA332, congratulations!Greg

Thank you, I'm glad you enjoyed it!Greg

Thank you!Greg

Thank you banman11, I'm glad you enjoyed this mechanism!Greg

Thanks Cesosas, I truly appreciate it!Greg

Hi GustavoV43,I retired at the age of 50 after selling my company. Over the years I designed 37 video games for Tandy, Electronic Arts, Activision, and countless others, along with using my graphics engine in flight control systems for numerous commercial, corporate and military applications. All during that time I worked with mechanical engineers and machinists and truly admired their skills. This model, and most of my other designs, is a result of my admiration of their work and appreciation for how truly difficult it is.Thank you very much!Greg

Hi L.D.T.,You're welcome! I believe this profile showed up in the 4.0 release of Ultimaker Cura, and it has remained ever since. I do use it almost exclusively as the accuracy of the parts is quite high.Greg

Hi darrell-currington,Thank you very much!I purchase these motors from a variety of sources (e.g. eBay, amazon, etc.). If you search for N20 120RPM you will find many sources.Greg

Hi hbmueller,Let me start by saying when I receive notes such as yours regarding a mother/son, father/daughter, family project etc., it makes all the time I spend designing these mechanisms worth every minute.Regarding the dominoes, they are 3D printed as well and I've included the model in this Instructable.Many thanks!Greg

Hi seamster!I was 26 years old when the original toy was introduced and do not recall seeing this one at all until it appeared on Tim's website!As you may know, I enjoy mechanisms such as this one and it was a treat to watch the grandkids and my wife making their crayon tracks on butcher paper!Many thanks for everything, and I'm truly glad you enjoyed this model!Greg

No, I have not. Until you comment, I had not even heard of the mechanism.Greg

Hi L.D.THere's a screen shot of the different "standard" profiles provide in Ultimaker Cura 4.12.1:I hope that helps!Greg

Thank you very much!Greg

Hi Barrythegreat!I'm glad you and your niece had fun with this model, and thank you very much!Greg

Thank you! I'll keep the solar version in mind!Greg

Thank you 1Wally, and you are very welcome!Greg

Not at all! My poor attempt at humor yet again…Greg

Thank you very much mwitherspoon, I truly appreciate it!Well my "legitimate" reason for purchasing 3D printers was, well, marble machines!Thanks again!Greg

Thanks Survive-Pi!The action is a side effect of the carriage design which, as the carriage turns the corner, the angles of the different components require the pin in slot to lengthen the carriage.Greg

Thank you very much, I'm glad you enjoyed it!Greg

Thanks n4mwd, that is usually my goal, family time!Greg

Thank you JohnnyD123, I'm glad you liked it!Greg

Hi caswm01,The R08 O-Ring inside dimension is 11mm, with a 2.5mm section.Greg

Hi Again Goepez,No, I have not. The simple method would be to place wires on a non-conductive track connected to a coil and power supply. The wires should be positioned at a location that will push the magnetic ball away from the coil.Hope this helps!Greg

Hi LeftPawn,The motors I'm using are the same ones I used in my wifi propeller boat model and are rated at 25,000 rpm at 12vdc. I'm running the motor in this model at 3vdc.Greg

Hi goepez,Yes, this mechanism uses magnetic ball and coils to accelerate the ball. There are a couple of control mechanisms I have seen for this; one being simple wire contacts at strategic points on the track, and another being magnetic sensors. Either way energizes the coils at the precise moment to accelerate the ball.Greg

Thank you so very much M.C. Langer, I truly appreciate your comments!Greg

Hi harnon,Thank you very much! I'm sincerely thankful that you enjoyed this project, and loved your "pun"!Greg

Hi lee78,Thank you very much, I'm glad you liked it!Greg

Hi ArthurJ5,Thanks very much, I'm glad you enjoyed it!But, I don't sell these models.Greg

Hi NirL!Many thanks, I'm truly glad you enjoyed it, and you are very welcome!Greg

Hi donutboy333,Thank you!Three of the "perpetual motion" models that appeared in my suggested video feed use the technique you described, and they all were very quiet!Greg

Hi MirabileVisu,Thank you so very much for your kind words, and I'm glad you enjoyed this model!Greg

Hi LeftPawn,Congratulations, that looks gorgeous, and thanks for the comments!Greg

Not in awhile, they can be kind of dangerous, especially when I operate them!:)Greg