Functional Bicycle

by thomasgivan, published

Functional Bicycle by thomasgivan Apr 24, 2014
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This was made for my final project in my 3D Printing class. It is a functional miniature bicycle with moving handle bar, moving wheels, moving crank, and moving pedals. Spinning the pedals spins the back wheel once a rubber band is added. Assembly required. Some sanding required as well. All bike parts were taken from AutoDesk and constructed in TinkerCAD.


The handlebar must have supports and must have the supports fully removed and sanded. The large cylinder in the "all_pedal_parts" file connects the two cranks. The part in "all_pedal_parts" that holds the chain and has a hole going through it entirely will go on the large cylinder next to the right crank. The other part that holds the chain (with a hole going through half-way) will need to be glued to one of the axels, on the outside of the right side of the frame. Then one wheel will need to be glued to that axel, on the inside of the right side of the frame. The other axel will need to be shortened and glued to the other wheel to be put in the fork connected to the handlebar. The small rods in "all_pedal_parts" go through the foot pedals and into the small hole in cranks. You will need to sand some of the pedal parts.

Instead of sanding the axels, you could make the holes bigger for the front and back wheel axels in the handlebar and frame (in a modeling software or with a power drill like I did).

Make sure the back wheel is aligned as perfectly as possible with minimal rubbing on the frame when spun. This is the trickiest part. Attach a small rubber band to the pedal and back wheel to make sure the back wheel spins easily.

Then when you have the back wheel ready and the handlebar ready, you are ready to glue the two frame halves. When glueing, make sure the handlebar is in place and the back wheel axel is in place. Then the left crank and pedal can go on, glued if needed. When the rubber band is attached, you should have a fully operational miniature bicycle!

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Amazing design!!! Could you post the bike in one piece as well? I would need this for a 1:24 Diorama.

I would love it if you would share the source files too.
I printed the files as they are, but the handlebar part doesn't fit in the frame - the rod on the handlebar that goes in the hole on the frame is too short, so I need to make the rod about 2 mm (1/16 inch) longer.

I was unable to find the original source of the handlebar before I edited it, but I have uploaded a new file with the rod separated from the handlebar. Hopefully it will be easy to edit the length of the rod to your liking in a program like TinkerCAD. I hope this helps.

Thanks, that should solve the problem :-)

By the way, the center-holes in the "chain"-disc parts are off-center. Fortunately they were easy to reproduce in TinkerCad.

Hello. I want to know if you have used 1.75 mm or 3 mm filament for printing this bicycle?

I'm printing it using 1.75 mm ABS right now. But the filament diameter should not affect the print. Unless you plan to print it in NinjaFlex or similar.

What is the size of the bike ready?

It's about 10.5 inches long, 6.5 in. tall, and the widest part (the handlebars) is about 3.75 in.

got all parts to print but left side frame is hollow is some spots using simplify3d tried to fix no luck

I just uploaded a few extra parts for anyone that loves there bike as much as i do mine. Thanks thomasgivan for this wonderful bike. The parts are: A printed basket, kickstand and nameplate. The items can be downloaded and printed here: http://www.thingiverse.com/thing:685265

Enjoy, Rick.

Bike extra parts

i have to print this -