bike spoke magnet mounts

thingiverse

These are simple magnet mounts to suit common flattened spokes (approx 2.5x1.5mm) or round (~2mm) spokes. They require one 3mm diameter, 4mm long rare earth magnet (available on Ebay - try searching: "rare earth magnet 3mm diameter") and a 6mm x 2mm diameter screw (for clamping it) to complete the item. SAFETY NOTE: These magnets represent a hazard to small children who may ingest them and they can cause serious gastric problems if more than one, or one and another ferrous object are ingested. DO NOT LEAVE THESE MAGNETS, OR ANY ITEM CONTAINING THEM THAT IS SMALL ENOUGH TO INGEST ANYWHERE A CHILD CAN ACCESS THEM! Seek medical attention immediately if ingestion is suspected as surgery may be required. The rare earth magnet should be a tight press fit into the end, but I recommend the use of a little epoxy or super glue as well (see safety note above). The standoff type units must be forced onto the spoke by slightly opening the slot with a screwdriver, then the 2mm screw should be used to clamp the item onto the spoke. It is much smaller, lighter and less draggy than the big barrel that came with my cycle computer! I do not guarantee the clamping force from the screw will necessarily be adequate for all situations to keep the unit stably mounted. However, it worked fine for me. A flat version in line with the spoke line is also included. Note that there are a couple of extraneous bars in the print. They are just there to assure bed adhesion.