Screwable Seat Post Mount for the OpenBikeSensor

A screwable seat post mount for the OpenBikeSensor

OpenBikeSensor is an open source, open data and citizen science project.
See https://www.openbikesensor.org/ (only in German language available).

You can find a translation of the description in the PDF “Instructions_OBS-DisplayUnit_tactileSwitch” of my alternative display unit for the OpenBikeSensor.

Sizes

The parts are available for seat post tube diameters of:

• 27.2 mm
• 31.6 mm

That should fit for most of the bikes.

Part list:

• All parts for printing are in the slicer file (2x clamps consisting of two parts, 1 mount)
• 4x Hexagon nut ISO 4032 M3 (steel or stainless steel)
• 4x Socket head screw ISO4762 (DIN 912) M3x14 (or M3x16 or M3x18), steel or stainless steel, doesn't really matter)

Printing:

Printing in PETG is advised.

Nozzle 0.4 mm, Layer height 0.2 mm. 5 wall loops, alternate extra wall (to get a strong bonding to the infill). 4 top and bottom shell layers, Infill 30 %, infill pattern triangles. Wall printing order “Inner/Outer”.

Mounting of the nut:

The part was developed to press in the nut so it will not fall out during handling.

To mount the nut take the counterpart and one M3 screw (easier with a M3x8 like commonly used for assembling the OBS). Insert the nut through the pocket on the side and the screw through the hole and fasten (see photos). The nut will be pressed in into the hexagon pocket.

Mount it on a bike:

The pipe clamp snaps into place on the pipe. Tighten the screws until the mounted sensor can no longer be moved to the side with light force.

FreeCAD-files:

The FreeCAD model files are published too. Change the “Configuration” to get the desired dimension.

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