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Better printable Cherry Pitter

by Pogoner May 30, 2018
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Works like a charm!
The 2 parts of the base fit really snug so didn't even glue them yet. The plunger has enough clearance, so ideal

Great design !
Not sure if it's our cherries or what but I find it fires the pits out the base like a gun :-)
Almost as hard as I can spit them :-)

Many thanks. Printed mine in pla. 0.24 layer height around 100mms. Dimensions were spot on, printed great. Took 2 hours 20, used 54 gms. So yep almost bang on £1 in plastic :-)
Much easier to use than the spring loaded scissor thing I usually use.

Glad you like it - if you find time to take photos, I'd be happy to see your pitter as a make :)

Used it for about 5 kg / 10 lbs cherries. I glued the top section to to bottom section to be able to use it on one hand.Standing it was way too slow.
I started pushing from the end of the cherry, but found that too often it pushed the stone to the side rather than out. Then started putting them in sideways. and still get between 1 in 10 and 1 in 20 where it will not take the stone out. Maybe make a deeper / narrowing guide to hold it in center.
Also found that you can buy some with a feeder mechanism like this: https://hjemmeproduktion.dk/shop/kirsebaerudstener-353p.html

This seems cleaner and faster. Will look in that direction next year if we get cherries again. This was first time we had from our tree.

PS: I printed in PETG, as it is likely as foodsafe as PLA. And since I can clearly taste bitter when touching PLA with my tongue, I refuse to use it for any food contact. It clearly gives off something, harmless or not.

It is designed to be used in one hand and to be glued like the original design. After a few tries I put the cherrys upright in the pitter (entering where the stem was) and push them out to the bottom, holding them with the other hand in place, and I think I had no cherry where it didn't take the stone out in this orientation (since then they are automatically centered by the bottom hole and the shape of the cherrys).

As for a feeding mechanism: This design is meant to fit in a small kitchen drawer - using it once a year for 2-3 hours with a material cost of about 1€ in plastic. If you aim for conveniently processing above 5/10/20 kg of cherrys and you have the place to store the device for the rest of the year, the linked 40€ cherry pitter is indeed more suited to your needs.

If you are worried about foodsafety, I would advise to clearcoat the PLA/PETG-parts that have food contact.

Thanks for your feedback - I would be glad to see your pitter posted as a make.

It looks like it was for standing up, but glued it, and that worked mustly OK. Not sure if the problem was that I had pretty ripe, almost black cherrys - Likely too ripe, as cooking them, they needed very little sugar and lots of lemon juice. The harder ones all went without a problem. It worked well, and way better than another simpler model I tried.
Got some splatter from juices, so one more thing I would change would be the the seed comes out to minimize that.

For making things foodsafe, I am considering using "vandglas" aka natriumsilikate / SodiumSlikate (Na2Si3O7), which is used to make 100% bacteriaproof coatings. And it is pretty cheap. People use it to waterproof vases etc. It is a prettyy cheap liquid.

Will post a make when I get a picture taken.

Can you post this as separate pieces? My printer bed is really small unfortunately but all the pieces would fit if I could rearrange them.

I have splitted the files - you can now print as you like.
If you do, I would be happy if you post it as make :)

Impossible to slice properly or even fix the geometry with Meshmixer :(

I reworked the middle part to slice more consistent in other programs. Please report if you still have problems.

Thanks a lot, it worked !

Every time i try slicing this the main body always misses a layer

I reworked the middle part to slice more consistent in other programs. Please report if you still have problems.

This is a great idea ! How does it do with plums of damsons ?

I did not try it for plums but if I was to try, I would scale it to 150-200% depending on the plums diameter (Or even remix it since plums may have higher demands on gripping the stone and structural integrity than cherrys).