by Gyrobot, published

Grinder by Gyrobot Jan 1, 2014



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27312Views 5454Downloads Found in Kitchen & Dining


A printed grinder in the shape of a grenade,
Print without support, it's all in the geometry!
For seeds, herbs and spices.
Assembly Video : http://youtu.be/812oWE_U3TY
EDIT 03/01/14 : Modified Inner grinding drum to have a conical top. Aids grabbing the medium to draw it into the teeth of - DOOM!
EDIT 02/01/14 : Added optional handle clip. FIRE IN THE HOLE!


Print without support.
TIP: Due to some internal female chamfers, it prints better as a plate or multiple quantities to allow cooling between layers and reduce the possibilities of dropped loops. However I do not have a print fan so YMMV.
I guess the video and images speak for themselves in terms of assembly.
To Use:
Pop your grinding medium into the spout and hold the grinder in your palm horizontally with the spout at the top (which helps contain the medium). Turn the handle clockwise to grind, when finished orientate the spout for pouring (to bottom) and keep turning the handle to allow the medium to flow out.

Disclaimers : Needs a few minutes of turning to bed in the grinding teeth and to remove any plastic burrs that may have built up during printing.
  • Wash thoroughly.
  • May contain nuts.
  • Not for human consumption.
  • Contains small parts.
  • Flammable.
  • Blah Blah Blah.

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Could you put holes on the innder grind sleeve so that grinded herbs collect in the central tube?

Im using a XYZ 2.0 Duo and the slicer they provide will not slice the handle and comes up with a error code. How do I get around that or fix that?

printed!! love it!!! buttttt the handle is somewhat loose. causing the tork to be useless causing the the grinder not to grind well . maybe instead of a tear drop style fitting, u could make it thread so when tight u can crank on it? also maybe a little more space between teeth for grinding herbs???? please and thank you

I find that the handle has issues with breaking from force, and was wondering if you could design an alternate way to twist it. You could make a round base with the same key shape embedded within.

Have you printed it with solid infill? Does it still break?

I have, and they will in time with heavy usage. Mostly I would just like an alternate method of grinding, and think a round base could double as a container and an easy method of grinding.

Hey! I just remixed the top plug to bypass the handle if anyone still needs it

Hand Twister Mod

Do you need to print support material for the handle

Hi, no, the handle arm is 45deg so if you can print this angle you should be ok.

great thanks.

Hey what layer height are you guys slicing at. I almost have always used .2 but a new setting recommended by maker of machine was.3 but It seems that is a little to thick to deal with the overhangs. I will give it a shot at.2 but what did you guys use?

I slice at 0.2 and print 45deg overhangs without issues. Due to the nature of a thin edge on a 45deg it can curl up (even with PLA) if the hot end doesn't allow it to cool and set before the next layer is printed. If it does curl up then there is less support for the layer above. Therefore see my tip in the instructions tab about printing 45deg overhangs, especially internal female chamfers. Printing a plate of bits rather than printing individually is better because it allows better cooling between layers.

good test last night, everyone was very impressed...just a note: if I load the media into the bottom, for grinding....and that media is not pre-ground a little, its too big to fall into the grinding teeth....perhaps taller teeth and smaller center DIA or small taper at bottom of grinding part, may help in this situation....or maybe you have that waiting for the Greninder XL...;)

Thank you for the feedback, tomorrow I will add a tapered corkscrew (think cartoon tunnelling machine) to the top of the the inner to draw the herbs and spice mix down into the teeth. Watch this spaced!

Ledgend!! Love your work!!

Done, see new stl.

just gave it a quick test....I printed @ 0.25mm, should have been 0.30 on my printer, so the handle is a better 'press fit'...in my case as I try to withdraw the grinder part, my handle just comes out...I will re-print just the arm on 0.30mm, for more of a tighter fit of the handle to the threaded cap. I load from top, invert, grind and pour....

Thank you for printing, when I designed this there is a slight clearance fit between the handle and the plug, I guess it printed a little tighter for me. You could also scale the handle slightly or better still, increase your flow rate.

every printer is different and if I had have printed, with my layer height, @ 0.30 it would have printed prefect with great a interference fit...;)

if I don't invert, media stay in the bottom, non grinding section.

I grind seeds which simply just roll into the grinding teeth with a slight till of the wrist. YMMV depending on the medium.

Brilliant, just brilliant!

Top marks!! looks to be ABS?? or is it PLA?? would you think, over time bits would break off and get in your 'herbs'??
would PLA be better for this you think?? cheers K

This was printed in PLA, which is safer for ingestion should you prefer to eat refined corn starch.

totally....I have some colour fab PLA, in 'green' that will work great.....thx for doing it, and offering your great work!! thx again Kerry

It will blend a variety of mixes........or mix a variety of blends!!!!!

Beautiful. I love it! which software did you use to design it?

Hi, thank you, I design in Catia V5.

So, what are you supposed to grind with it? Lemme guess: 'festival herbs?'

It's in the info, but not limited to.

Looks great, thanks for the post! I like the video and the way the handle fits onto the head, very slick.