Bicycle dummy pedal

See https://www.instagram.com/p/CNA9ocSBPBU/ for more info. Full sized bicycle dummy pedal designed to be stronger than previous fully printed versions. This one is designed to work with an M6x100 bolt. Can be used with a furniture bolt as well. Make sure that whatever bolt you use at least makes it into the threaded part of the head for the best strength.

Sourcing the hardware

An M6x100 bolt isn't the most common thing, but it gives the tool much more strength than if you used a shorter screw. If you're in the US, you can source the bolt from McMaster-Carr, and the best choice is product number 91292A205 - M6x100 screw in 18-8 stainless steel. It costs more per screw than the plain steel, but since it comes in a pack of only 5 screws, it winds up being cheaper than the plain steel in a pack of ten. The biggest issue with McMaster is the shipping can be pricey.

If you want to go with Amazon, a search for “M6x100” should give you plenty of options. At the time of writing, the top hit was a 6 pack of fully threaded screws for $6.99 - slightly more than McMaster but eligible for free shipping if you've got Prime. Another option is “crib screws” or furniture screws which have a larger head. This design is compatible with those.

Unfortunately just about any option you go with will result in you having to order a set of screws. Excellent opportunity to print some for your friends, but remember this has a noncommercial license so you are not allowed to sell them.

Finally, if you can source an M6x100 screw but it has a hex head, see this remix for the axle portion with provision for that.

This is another remix that uses an M6x30 screw which is common in headset topcaps, but understand that the tool will be significantly weaker without the full steel backbone. Should still be perfectly usable for tuning gears and other light duty work, but definitely don't use it to set a quick link. The big benefit is you will likely have that M6x30 screw on hand already.

Printing

Axle and handle both optimized to print at 0.3mm on the MK3S in PrusaSlicer. Neither needs any lower layer height and you'll just wind up with a longer print. I usually bump perimeters to 3 for both the handle and the axle.

Because of the threads, I print the head finer, although 0.2mm has proven to be fine. Can go to 0.15mm if you feel like it, but no real reason to go any finer than that. Give the head plenty of perimeters - I go with at least five so that the threaded end is solid, but then you can stick with the default 15% infill for the grip part of the head.