Hands-free door openers - Cylindrical

grabcad

A more rigid variant of the Materialize hands-free door handles. These designs are intended for heavier doors. When 3D printed, increase wall count (2 or higher) for added strength. When oriented on their sides, no support is needed.~Grip~Electrical/insulation tape works best; apply by stretching tape around the portion of the handle where you will mount the parts. Rubber bands do not work as well. Using double-sided tape is not recommended nor is the inner tubing of bicycle tires.~Advice and Caution~Take care to avoid the screws from sticking out too far. It's possible they hook onto your sleeve and damage your clothing or scratch you. Therefore use M4x10mm screws if the door handle is a bit narrower. Alternatively, you can apply another layer of insulation tape. While using these do not guarantee that you will not be contracted with COVID-19, they may significantly reduce that likelihood._____*Version 1*For B's, use a brim so they don't topple in case of poor print bed adhesion.Wide: 60mm- 4x M4 12mm flathead screwsExtra wide: 80mm- 6x M4 12mm flathead screwsHole diameter: 20.8mm_____*Version 2* The problem with the initial design was that it would slip, especially for heavier doors but even for lighter ones given enough time. This is now fixed. To assemble it: 2x M4x25mm rubber rawlnuts2x M4x25mm socket screws2x M4 washers2x M4x12mm 1x aluminum tube (10mm OD, 68-68.5mm in length for wide, 88-88.5mm for extra wide)A larger part B diameter will cause the door opener to sit at a steeper angle. Test different sizes and see which one works for you, though 20mm is recommended. If a handle is not open-ended, you can pull apart the door opener and fit it over the tape. Pros:- Does not slip- Handles higher loads better- Rounded edgesCons:- More hardware components.- More expensive_____*Update V2.1:- Made text more legible- Larger nut slots- Improved topology