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Dual Mode Windup Car is my first attempt at an enclosed windup vehicle. My previous designs have been "open chassis" to reduce weight, and of course so that I could watch the gears in motion (I truly like watching gears in motion, but it's just a hobby, I hope). This enclosed windup vehicle is a significant weight increase over the open chassis designs, and to compensate I did increase the final drive gear ratio from 1/25 to 1/16 to increase the torque. As such, I also strengthen the axles and gears to handle the increased torque. After testing, this vehicle easily traveled around 40 feet over the rough epoxy surface in my workshop. I'm still learning Autodesk Fusion 360, but it was instrumental in the design and appearance of this vehicle.

Dual mode refers to this vehicles two modes of operation, power and coast. Once the spring is wound using the key, releasing the vehicle propels it forward until the spring is depleted of its stored energy. This is the power mode. When the spring energy is depleted, the rear axle is disconnected from the spring motor via a floating pinion gear allowing the vehicle to truly coast. This is the coast mode.

The wheels and body top as shown in the photographs and video are designed for a dual extrusion printer, however I have included single extrusion versions of all the necessary parts.

You will need to purchase 16 "AS 568" size 222 (1 3/4 O.D., 1 1/2 I.D., 1/8" diameter) o-rings for the tires.

I probably forgot a file or two or something, so if you have any questions, please feel free to ask.

Designed using Autodesk Fusion 360, sliced with Cura 2.3.1, and printed on an Ultimaker 2+ Extended and an Ultimaker 3 Extended in PLA.

Step 1: Print and Prepare the Parts.

I printed my parts on an Ultimaker 2+ Extended and an Ultimaker 3 Extended using .1mm vertical resolution and 100% infill for "Axle Spring.stl", "Key.stl", "Pawl.stl", and "Spring.stl", the remaining parts at 50% infill.

Print two "Cross Member.stl", two left and two right wheels of your choice (dual or single extrusion), and one each of the remaining parts.

Prior to assembly, test fit and trim, file, sand, etc. all parts as necessary for smooth movement of moving surfaces, and tight fit for non moving surfaces. Depending on the colors you chose and your printer settings, more or less trimming, filing and/or sanding may be required. Carefully file all edges that contacted the build plate to make absolutely sure that all build plate "ooze" is removed and that all edges are smooth. I used a flat jewelers file and plenty of patience to perform this step.

Study "Assembly.stl", carefully noting the locations and positions of the various components as assembly proceeds.

Finally some terminology. When "press" is used, this means the parts must fit tight and as such must be pressed together using a vice, C clamp, slip joint pliers or equivalent. When "place" or "slide" is used, this means the parts fit loose and should slide / rotate freely. The body side references of "right" and "left" are in relation to the vehicle itself as if you were sitting inside.

<p>Great design! I've saved all of the STL files for a later date so I can make one for my grandson. How big is the toy car in size? I have an original Makerbot Replicator 3D printer. Will I be able to print it on my machine? My build area is 6&quot; x 9&quot; x 6&quot;.</p>
Thank you so very much, I am sincerely glad you liked it!<br><br>The &quot;longest&quot; parts of the car are the body sides and top, which measure about 8&quot; long. When you print yours, see if it fits on the build plate &quot;diagonal&quot; (e.g. corner to corner as opposed to front to back). It may be close!<br><br>Thanks again!
<p>That's cool how far and how fast can it go?</p>
I runs 40 feet in my shop then as you can see in the video it hits the door. Because of the additional weight, it doesn't accelerate as fast as the rolling chassis version, but for top speed, I've never checked.<br><br>Thanks, glad you liked it!
<p>Great design-Surprising power from a PLA &quot;spring&quot;!</p>
Thanks!<br><br>I spent more than just a few hours designing, printing and testing spring configurations before I finally succeeded. One thing is for sure, always print it at 100% infill.<br><br>Thanks again, glad you liked it!
<p>Nice design! Good luck!</p>
<p>Thanks! And I'll need it, there are a great group of designers here!</p>
<p>It can go really far! Nice design</p>
<p>Thank you so much, I'm glad you liked it!</p>
<p>I really need to buy a 3D printer now...</p>
Thanks! I sure like the Ultimaker!
<p>Yes, I like it. And i hope for you, that you will get a good result in the contest!</p>
<p>Thank you very much!</p>
looks awesome
<p>Thank you very much, I'm glad you enjoyed it!</p>

About This Instructable

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Bio: Formally the owner of avionics (EFIS, FMS, etc.) and video game design (Tetris, Robocop, Predator, Michael Jordan in Flight, and a number of others) firms ... More »
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