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Thread: Lower hopper for a Mazzer Robur

  1. #1
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    Lower hopper for a Mazzer Robur

    Gene Cafe Coffee Roaster $850 - Free Beans Free Freight
    Has anyone replaced the hopper on their Robur with something with a lower clearance to fit under kitchen cabinets? I estimate I probably need to halve the height of the hopper.

  2. #2
    CoffeeSnobs Owner Andy's Avatar
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    I'll be interested to hear if you have any joy.

    I took a Robur hopper to a "plastic expert" a few a years ago expecting that they could cut it down with a hot-knife or similar and they wouldn't touch it. These guys bend, shape, cut all sorts of plastics and wacky compounds. Apparently they said it would shatter unless it was cut within a few weeks of manufacture.

    If I ever get hold of a broken one I'll have a play and see if they are right.

  3. #3
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    Quote Originally Posted by Andy View Post
    I'll be interested to hear if you have any joy.

    I took a Robur hopper to a "plastic expert" a few a years ago expecting that they could cut it down with a hot-knife or similar and they wouldn't touch it. These guys bend, shape, cut all sorts of plastics and wacky compounds. Apparently they said it would shatter unless it was cut within a few weeks of manufacture.

    If I ever get hold of a broken one I'll have a play and see if they are right.
    Thanks Andy. None of the smaller Mazzers have lower profile hoppers that fit a Robur, do they?

  4. #4
    Senior Member Gavisconi007's Avatar
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    A 60 mm outside diameter Perspex tube does the trick, cut to suit your cupboard door swing height.
    garbage and Javaphile like this.

  5. #5
    Super Moderator Javaphile's Avatar
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    There is a low profile hopper available for the Super Jolly. Odds are you would need to build up the end of it a bit to get a good fit, easy enough to do.


    Java "Hopping along" phile
    Toys! I must have new toys!!!

  6. #6
    Mal Dimal's Avatar
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    Even a standard Super Jolly hopper would probably be able to sneak in under the height of the overhead cupboards...

    Mal.

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    Quote Originally Posted by Andy View Post
    I'll be interested to hear if you have any joy.

    I took a Robur hopper to a "plastic expert" a few a years ago expecting that they could cut it down with a hot-knife or similar and they wouldn't touch it. These guys bend, shape, cut all sorts of plastics and wacky compounds. Apparently they said it would shatter unless it was cut within a few weeks of manufacture.

    If I ever get hold of a broken one I'll have a play and see if they are right.
    You can cut them, I've sliced up a very second hand broken one successfully with a fine toothed hacksaw blade. The trick is holding/bracing it in a way that ensures you don't flex it too severely while cutting it, and to keep the blade almost parallel to the surface of the plastic while cutting.
    Andy likes this.

  8. #8
    Senior Member Lyrebird's Avatar
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    I agree with the above, but IMO the tool of choice is a dremel with the "plastic" cutting disc.

    I assume the hopper is made of PMMA*; if so it cracks like a bastard if notched but the dremel tool effectively melts its way through so the chance of terminally effing the thing is much reduced.


    *PMMA = polymethylmethacrylate, AKA Perspex (a trade name).
    Dimal likes this.

  9. #9
    CoffeeSnobs Owner Andy's Avatar
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    Quote Originally Posted by garbage View Post
    Thanks Andy. None of the smaller Mazzers have lower profile hoppers that fit a Robur, do they?
    The gotcha is the "hopper removed" safety switch found on the Robur and the Kony, finding something to fit the throat would be easy enough but disabling the safety switch wasn't an option for mine as it was going on a commercial site... some nuffy would put their fingers in there one day for sure.

    The other thing to keep in mind is that you have to get beans into it and moving a 25kg grinder forward each time (if it's cupboard overhead) would be no fun. You probably need 6"-8" of clearance overhead of the top of the hopper to be able to pour a bag of beans in comfortably and without too much spillage.
    Dimal and garbage like this.

  10. #10
    Life-long Learner DesigningByCoffee's Avatar
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    I began rolling up a paper tube for proof of concept, then went to an aluminium micro-hopper finally. The safety microswitch is just held down with some folded sheet metal with a few layers of shrink wrap

    DBC-Micro-Hopper_FMD4616.jpg DBC-Micro-Hopper_FMD4739.jpg DBC-Micro-Hopper_FMD4626.jpg
    Dimal and Yelta like this.

  11. #11
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    Update - I went to a place in Arncliffe (Sydney) called Plastix and they cut my hopper up neatly same day service. $66. The lid is now very slightly loose as the diameter lower down is slightly less than it is up the top. Happy with the result and my grinder doesn't have to live on the island bench anymore!
    Andy, Dimal and level3ninja like this.

  12. #12
    CoffeeSnobs Owner Andy's Avatar
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    Nice one.

    That's what I though resiplex would have done but they wouldn't touch it.

    I understand the loose fit lid due to the slight taper on the Robur hopper, thought that would easy enough to fix with a strip inside the lip of the lid or around the hopper if it was a problem

  13. #13
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    Quote Originally Posted by Andy View Post
    Nice one.

    That's what I though resiplex would have done but they wouldn't touch it.

    I understand the loose fit lid due to the slight taper on the Robur hopper, thought that would easy enough to fix with a strip inside the lip of the lid or around the hopper if it was a problem
    Here's a photo of the end result. Cost was actually $40 not $66.
    Attached Images Attached Images

  14. #14
    Senior Member Gavisconi007's Avatar
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    I’d go with a Perspex tube straight down into the throat of the Robur. Maintains a surcharge whilst minimising the quantity of beans going stale

  15. #15
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    I don't have an issue with the hopper size but then I have plenty of space. The throat on the Robur hopper holds maybe 3 double shots of coffee and most of the time I just fill it to the top of the throat and maybe slightly more.

    I love the Robur. It is overkill and huge but it is lovely.

    I try not to be too anal about stale beans. I mean beans naturally age anyway, it is normal so whether they age in a sealed container or the hopper is not something I worry about too much and anyway the maximum residence time in the machine is no more than 24 hours.

    It isn't for everyone though. I get visitors who marvel in my wife's patience with me but really I got the brand new Robur so cheap, it would have cost me as much or more for many of the kitchen grinders people use on the forum anyway.

    Getting custom built stuff is always going to be expensive.
    Dimal likes this.



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