Despite putting an entry into Ender5r's awesome FreeCAD Challenge tread, I never got around to actually printing one. If you haven't read that thread, you might want to scan it quickly. I was about to print a seat back bag hook yesterday while I had PETG loaded in my printer when I ran across another design that I really liked on Thingiverse. I decided to mash-up the elements I liked in that design with the idea from the FreeCAD challenge of incorporating a gap between the hooks to make it easy to grab the bag with a finger.
So here are the elements of this design challenge:
Of course I made my own design, but I will wait till tomorrow to share it. We wouldn't want to taint the imaginations of any other participants, now would we.
Some example measured dimensions if you want to test your design:
So here are the elements of this design challenge:
- Use any parametric CAD application to design a seat back bag hook
- It should mount to a car's headrest post and hold a bag suspended behind the seat back.
- Optionally, it can be spun towards the front for holding a bag suspended over the head rest's seat.
- The design should prioritize the ease of grabbing the bag with one hand. (See Ender5r's post here for an example.)
- There should be no sharp corners or edges that could cause injury to a flailing hand.
- When printed by FDM printer (you pick the model and slicer settings), it should be able to carry a 38 lb bag in a moving car without breaking or failing to hold the bag. (That weight came from the first Google result of a search for "average weight of a grocery bag")
- It should mount to a car's headrest post and hold a bag suspended behind the seat back.
- Make the design parametric so that it accommodates the measured parameters from a variety of cars:
- The caliper measurement of the headrest post diameter.
- The measured distance from the post axis to the edge of the seat back.
- Size of the finger gap (or other hand dimensions if your design accommodates one-handed operation without the use of a finger gap.)
- Width of the bag handle.
- Any other parameters needed to make your design fit different cars, people, and bags.
- Imbue a measure of style, form, or flair into your design.
Of course I made my own design, but I will wait till tomorrow to share it. We wouldn't want to taint the imaginations of any other participants, now would we.
Some example measured dimensions if you want to test your design:
- 2019 Subaru Outback
- headrest post diameter: 12.76 mm
- post axis center to seat back edge: 58 mm
- 2007 Honda Fit
- headrest post diameter: 10.0 mm
- post axis center to seat back edge: 54 mm
- 2011 Toyota RAV4
- headrest post diameter: 11.94 mm
- post axis center to seat back edge: 62 mm
- Finger width: 20 mm
- Bag handle width (bunched up): 10 mm
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