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PolygonPusher

Hook for hanging pots and pans

by PolygonPusher Sep 25, 2011
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Uploaded a v02 of the hook with some improvements.

Added hanger tag for the taghunt.

How much did the hooks set you back? I'm wondering because frequently i see these cute projects that attempt to replace something commercial, but they end up looking like they cost more than their store counterparts (not to mention the printing time).

Wouldn't brass/bzp steel hooks screwed to the bottom of the shelves be cheaper (than $4 a piece)?

thanks

Thanks for your comment :) I live in Sweden and in the hardware stores that I have access to locally, most brass/cast-iron/plastic hooks that I found would cost between 3 and 5 Dollars. It is important to mention that none of the hooks in the stores had an adequate shape. Some where thicker and/or shorter than I wished them to be. So in other words the availability of a product with my desired shape was 0%.

I buy plastic filament and print lots of stuff, most of it is are just tests of shapes that I use to test the 3D printer and learn more about what can be done. The actual cost for the 27 hooks might just be a Dollar or two - in comparison to total price of 27 commercial hooks at 108 Dollars.

Anot
her cost to consider is time and travel costs. I would have to travel at least 20 km to the closest store. Adding to that is the fact that one usually tends to travel to several stores to be able to browse different models and makes. The cost for gas in my case as zero Dollars.

I agree that it took
time to 3D print all 27 hooks. I used my Makerbot Cupcake CNC. I printed them one at a time and it took about 20 minutes per piece. I have to admit that I recently got myself a Thing-o-Matic which would make 3D printing all 27 hooks a breeze since it has the automated platform. Another way to go wo
uld be to print them on a RepRap or other 3D printer with larger build surface where you can print several in one go.

Naturally the cost of 3D printing the 27 hooks was huge if I also include the actual cost of the Makerbot 3D printer. Nevertheless I don't see it that way, since I now see a 3D prin
ter as a natural thing to have in my home. I will fill several needs in a long-term basis and is will probably pay for itself in the future. :) A comparison would be having an expensive espresso machine at home and compare the price of a cup with the fact that I could get in my car and drive to rest
aurant to buy a "cheaper" cup of espresso.

:)

I see, fair enough. Even buying from an online hardware store (or ebay for that matter) wouldn't be an option?

I'm just wondering, because all the prices i've seen for PLA filament (1.75mm) is at the very least 40eur per kilo. I was just wondering about how in the end the total consumption of filament (its weight) compares to an off-the-shelf product. (I still don't have a 3d printer, comparing options rig
ht now).

I just ran one through skeinforge, and it told me that material cost is 0.10
€ per piece, weight is 4.9g and an estimated build time of 7:43 minutes (= 0.13€ machine cost, according to skeinforge). I get my 3mm ABS (PLA would probably be too brittle for the hooks) at GRRF for 49€ per spool (2.2kg).

Since i'm running a Mendel, i can print four at the same time. Even mo
re if i arranged them somewhat smart instead of just using skeinforge's multiply. Printing four at a time reduces the time per piece for me and therefore drives total cost from 23€ct down to 21€ct 8-)

Material cost is correct for me, but i don't know about machine (and power) cost, that might
be a little to low. Still, there's no way you could get one of those hooks for 30-ish €ct a piece anywhere.

Thanks for the detailed explanation. That was very informative and it seems to strengthen the fact that a home 3D printer is a good investment from an economic point of view - not to mention environmentally. Imagine the amount of electricity consumed by the 3D printer for making the 27 hooks, and compare it to the energy consumption of a car used to fetch the hooks in a store.

I admit that home 3D printing technology is not the solution for everything, but it certainly is exciting to open up some new unseen applications that give us consumers an advantage.

Indeed. Many thanks for the info!

I really like this as a solution, if everyone could design and print their own versions of traditionally 'off the shelf' items, customised to suit them, the world would be a much more interesting place.

I do have a small concern about this though, the images show the pans are positioned in front of a storage heater, and you are loading some of the hooks with cast iron cookware, with a mass of (I'm guessing) about 2.5kg (5.5lbs). Using the Hook stl, and assuming all of the load is vertical, this e
quates to a stress of 500kPa at the narrowest point of the 'neck'. Compared to the tensile yield stress of 'pure' ABS (approx 40,000kPa) this is not a paticular problem, but we don't have data for 'printed' abs, with the air gaps etc included.

More importantly, this constant high proportion of str
ess could lead to creep deformation occuring, especially if heat from the storage heater is conducted through the pans themselves to the hooks, giving localised heating to above 40C (105F). This could, over a surprisingly small amount of time cause the hooks to bend and the pans to fall off, potenti
ally causing an injury or a loud clang in the middle of the night...

Luckily creep in polymers is reversible if caught early enough, just shuffle the pans every so often to allow the most heavily loaded hooks to 'relax' and they will return to the normal shape. Keep an eye for the hooks bending, do
n't use the storage heater, or redesign the hook to distribute the force more evenly, or be more resistant to temperature (you could coat the arms with an insulating material like heat shrink tubing.

Wow, really long comment, sorry! Short answer - I like it, but it might break...

Rich.

Thanks for your comment Richard! :) I really appreciate your technical point of view regarding strength. A gut feeling is that the hooks will have no problem taking the weight of the cast-iron pans. Nevertheless one will have to wait and see. If it breaks that will be a perfect opportunity to re-design the hook and print new ones. :)

I realise that the old heating element is under the shelf. I actually is not connected to electricity at all since the kitchen now has even heat built into the floor instead. I will remove the heater in due time and replace it with storage boxes. Another problem having a working heater there is th
at it would crack the wooden board.

Cheers! :)

I've been looking for something like this. Very nice.

I am glad you liked it :)