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Dummy pedal for bicycle maintenance - redesign for FDM printers

Creation's quality: 5.0/5 (1 vote)
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3D model description

A redesign of my previous clone of the Park Tools DP-2 dummy pedal. The previous design used the same 5/16" thread for the shaft as the Park design, and that was a bad call. It's far too thin and far too weak.

This is a design based on the other but optimized for FDM printers and their limitations. Now there is no 5/16" thread - it's all 9/16" with the same short threaded bit so you don't have to screw it all the way into the pedal. The threaded insert is small and should be printed at 100% infill for maximum strength, but everything else can be a much lower infill.


  • Assemble the threaded insert into the shaft - it uses a Torx T30 on both ends, but you might be able to thread it in by hand.
  • Put the shaft with the threaded insert through the handle.
  • Screw on the grip until it bottoms out.
  • Confirm everything turns nicely

I made the T30 in the threaded insert a thru-hole as it is still possible for the insert to break if you're a bit too rough with things - and in that case having the T30 in there makes it easier to remove the remnant to install a new threaded insert. I keep a couple of the threaded inserts on hand as those are what will fail, and the rest of the parts should be just fine. (photos show an early prototype with provision for a slot screwdriver - I can post that if it works better for folks)

Also included is an STL for a pegboard holder which keep the dummy pedal handy.

  • 3D file format: F3D and STL
  • Publication date: 2020/01/30 at 03:49





Note: I wanted to try Cults3D as a possible alternative to Thingiverse, but after giving it a bit of a look, I'm not super impressed. Feel free to visit my Thingiverse page if they can manage to keep that site running:

I went to school as a mechanical engineer, and got interested in 3D modeling, specifically the SDRC I-DEAS CAD/CAM software system. This interest got me my first job working for a CAD/CAM reseller doing pre and post-sales support. I was lucky to be involved in 3D printing in the early 90s - for a demo of rapid prototyping, I modeled the mouse from my HP-UX CAD workstation and it was rendered via stereolithography. I still have that model, but across the years I stopped using CAD and moved to systems administration. Now that 3D printing is affordable and mostly reliable, I've gotten into it and am having a blast. I printed all the usual cute little trinkets and tchotchkes, but quickly got bored of that. What I find most interesting is needing something, then spending a little bit of time in a CAD program and soon after that having a real, functional version of the part in my hand.

I'm a cyclist and bike mechanic as a hobby and a side job, and have found endless applications of 3D printing to both bikes and bike maintenance. Coworkers have also come to me with many varied requests, each of which has been an interesting challenge and an opportunity to learn.

I am constantly learning, constantly trying to challenge myself to learn new things and technologies, so hopefully as I progress my designs will continue to improve.

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