Recent Topics

Sharing ideas is important, we help each other

by voodoopt

I hope this group can bring people together who have a hobby improve the bike trough usefulness of our 3D printers

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Rohloff Shifter - Any Tips?

by MattWhelan

I'm considering a Rohloff Speedhub for my next bike, but I like drop bars. The factory Rohloff shifter is a grip-shifter that mounts on 22.2mm diameter straight bars, rather than 23.8mm drop bars.

Because the indexing for the hub is all in the hub itself, rather than in the shifter, I think I could design and print a pretty nice grip shifter for drop bars, or possibly some sort of fat lever shifter, even. The most reasonable drop bar mounted solution that I'm aware of is Comotion's $250 shifter, which looks very nice, and seems to be milled out of nice metal parts, but frankly, I'd rather design and print something, so that a not-$250-solution will exist.

I don't think the actual CAD bit will be all that difficult; I have a fair bit of OpenSCAD experience, and the parts aren't all that complicated. I think. But, I'm wondering if anyone here has any tips about designing long-wearing all-weather printable bike parts.

I'm also wondering if anyone around here owns a Speedhub and would be interested in beta testing. I don't have that bit yet, and while the spec sheet from Rohloff is quite detailed, there's no substitute for trying it out.

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Any great bike hack you would like to share ?

by zBis

Hey guys !
We're a FabLab trying gather great projects about bike hacks in general, do you have anything in mind that would fit ?
And if you're working on any project we'd be eager to help !

Greetings from Vendée

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Let's Make a Custom Bike Light ^_^

by Spindoctor


I am unsatisfied with the commercially available bike lights.
They are either expensive, use uncommon battery types or can easily be stolen (when left on the bike).

Therefore I am willing to design a custom bike light. However, I could not do that on my own.

Would you like to join this project?

These are my design goals:

  • water proof
  • runs on a single AA or AAA battery
  • hard to steal (maybe fixed with an "unusual" screw)
  • runs on at least 4 LEDs

I already made some sketches for the design, but I lack the technical knowledge for the circuit.

Please tell me what you think!

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Drop Bars: Brifter/Brake Lever Angle Shim

by aiber

The Tektro RRL brake levers are arguably the best drop bar brake levers I've ever seen. The Tektro RL-340s & similar models (short pull version) are decent, but could be made more comfortable (in my opinion) if they had a smooth transition between the hood & the tops, in a modern style (see any current Shimano, SRAM, or Campagnolo brifter-to-handlebar transition).

Flat transition: https://coresites-cdn.factorymedia.com/rcuk/wp-content/uploads/2015/06/Specialized-Venge-ViAS-Tinkoff-Saxo-Peter-Sagan-04.jpg

TRP packages an extra shim with their RRL levers to achieve this effect: http://trpbrakes.com/pubs/RRL%20Brake%20Lever%20(B5).pdf (instructions).

Purely by guess, I think the shim may also work or be easily adapted to other Tektro models, & maybe beyond those too; I'm assuming the plastic body is roughly the same where it contacts the handlebar, so filing could bring it into a good shape.

Here is a picture of the shim: http://biketouringnews.com/wp-content/uploads/2012/03/IMG_2999.jpg

Perhaps using 3D scanning, the shim can be modeled for ease of 3D printing.

Without the shim, users are forced to choose a very "classic" hood-to-handlebar position (https://farm8.staticflickr.com/7063/6936342796_7a6741ee54_z.jpg) which hurts my & probably other people's wrists.

You can either do #1 (above) or #2 position them so the hood is flat, but that forces the whole body to move down past the tops: http://cdn.velonews.com/wp-content/uploads/2015/05/26.jpg

I've been getting by using old/broken Shimano brifters as brake levers, but this can be an expensive/hard-to-get alternative for other people.

I don't have one of these lovely brake levers though, & guessing the (intricate) geometry behind them is out of the question. Does anyone have one?

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