Tripod mount ring for Canon 100mm macro

thingiverse

Human: Origin: Canon lenses are fantastic, but Canon Inc. can be quite stingy about accessories. They often deliver their 100mm macro lens without a tripod mounting ring. In fact, they sell the ring separately for more than €200! So this is my solution. Strange shape: You'll find the shape unusual... I did too, but I can explain it. For the hinge, I needed 20mm of width. However, a 20mm ring wouldn't allow me to mount it onto my camera (and probably many others). So I made it 20mm on one side and 10mm on the other! It was done quickly. But there's another problem: if I placed the tripod fixation in the center of the part, the collision with the closing tabs would prevent the tripod fixation from being horizontal. To avoid this issue, I decoupled it. This is why the ring has an unusual shape. Hardware you'll need: - 1 × M4 12mm socket screw - 1 × M4 25mm truss screw - 3 × M4 nuts - 1 × M4 washer - 1 × "photo format" nut - 1 × "photo format" screw (won't be included in the ring) - 1 × 18mm wide band of adhesive felt pad Support: No support is needed because the two parts are designed to support each other. That's why I provided both parts in a single file, with precise positioning required. About the adhesive felt pad: You'll likely need to reduce the thickness of the felt pad band. This operation will be the final step before cutting the band into squares and attaching it to the ring. You'll need to assess the free space between the felt pad and the lens, then adapt the felt pad accordingly. Separating the parts: I recommend cutting as far as possible along the bridges formed during printing between the two parts before inserting the truss screw into its hole. Only then should you finish breaking the bridge by turning the parts around this screw. Be extremely cautious: turn the parts **around the screw** or you'll break it. Hinge screwing: The hinge must be flexible, so the screw shouldn't be tightened but rather left loose. You'll need a jam nut to lock the first nut without compressing the hinge and making it rigid. Additionally, place the two nuts in front so they won't collide with the camera and prevent lens mounting. Adjustment bolt: The nut's space is tight, making insertion difficult (refer to the picture for the correct position). When the nut is inside the ring, use the socket screw to force it into its position. Tripod fixation: The "photo format" nut's space is slightly loose. Insertion isn't a problem, but it won't stay in place naturally. You may secure it with a "photo format" screw and glue (using some filament extruded by your printer, for example).