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Hardware Thread, Primary School 3D printer in Technical; Simon, Have you tried printing without a raft? you may not always need one... Take a look at ProfTweak .. ...
  1. #31
    RTi
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    Simon,

    Have you tried printing without a raft? you may not always need one...

    Take a look at ProfTweak .. it lets you modify the MakerBot profile settings..

    Nothing Labs (Rich Olson): Introducing ProfTweak - a MakerWare profile editor

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    Quote Originally Posted by SimpleSi View Post
    I think the "raft" that it lays down got too stuck to the base and it pulled off
    Why use a raft?

    What can happen is that PLA warps and the edges start to lift up. You don't need much lift for the hot end to start interfering with the previous layers. The best solution to that is to use a heated bed.

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    RTi (15th July 2014)

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    Hi Simon if you are using the MakerBot Mini then the parameters can be changed. You have to create a profile then you can alter things such as the speed the machine lays down the raft and the initial layers of the print, this will hep it stick to the print bed better. The software is set on medium settings to give a pre defined print quality but as the Makerbot brand has stemmed from an open source back ground you can change nearly all of the settings in the Profile section of the software.

    As for the print speed, yes you are correct you aren't going to get 15 modes per 1 hour lesson, but if you view the Printer as a similar tool to be use alongside a CNC machine, milling machine or laser cutter but for rapid prototyping and design, production and evaluation then 3D Printing does offer excellent speeds and output. If using in a primary school the main benefit is engaging the pupils in the CAD aspect as often his is the first experience they have of this, designing Mincraft style Zombies or buildings is ideal.

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    SimpleSi (15th July 2014)

  6. #34

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    I tried creating a profile but it failed so I just gave up on it - its been a VERY busy weekend for me

    I'll try again tonight

    Simon

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    I tried creating a profile but it failed so I just gave up on it - its been a VERY busy weekend for me

    I'll try again tonight

    Simon

    PS I nearly reported you as a spammer - good job I didn't Ta

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    Hope you have some success tonight, with the settings and print. If you don't have any joy and want us to look at some setting with you please let us know.

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  10. #37

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    I can edit the profile - which is good

    Tried setting Raft to false - that didn't work out well - bit like a Start Trek The Movie transporter accident!

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    Quote Originally Posted by SimpleSi View Post
    I can edit the profile - which is good

    Tried setting Raft to false - that didn't work out well - bit like a Start Trek The Movie transporter accident!
    What is the bed on the machine? You could try the blue masking tape to improve adhesion or a very thin coating of diluted PVA (I use ~1:5), both will improve adhesion of PLA.

    The other thing to look out for is the height of the hot end from the bed on the first layer. If it is too high, you won't get good adhesion, too low and you get a very small lip on the first layer and unwanted extrusion on rapid moves (drool!).

  12. #39

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    @pcstru This is a plug n play 3D printer It comes with the blue masking tape

    I realised that it came with an .stl model called calibration box so I just printed that out this morning and the raft came off nearly 100 % - sharp knife would remove the little bits remaining.

    So I'm thinking that I may have just used two wrong test models for my first prints!

    Both the Compandion Cube and Die have patterns on the bottom layer so I'll try doing something a bit more like what a prrimary pupil would create and see how that goes

    Simon

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    So printed a few things and its safe to say this is not a machine to use for engineering protoypes

    The raft sticks to the object and its only truly removable using a sharp knife so its not a process that primary children can be left to on their own.

    Sometimes, the PLA "dribbles" - forms a little ball somewhere that then hardens and then the extruder hits it during rest of build process with very variable impact on the final print

    But the plug n play nature of the machine is superb and primary pupils can use Google Sketchup, simply export to .stl file and then load the stl file into Makerbot Desktop and press print.

    I'll have to look around (or get help from you lot of course ) on even simpler software to use for <Y5 but I'm sure if its not around already- then its going to come

    Simon

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    I suppose it depends on the school and teachers therein. Computer work in primaries seems a lot more hit and miss compared with secondary due to the lack of specialist teachers I suppose.

    Our 3d printer here doesn't get much use other than in "man parts waving competitions" I did 3D print a case for the Raspberry Pi's which worked rather well.

    If you have a good enthusiastic teacher you could get away with having one but for the majority I suspect it'd just sit there looking good when parents come to look round but never gets turned on category.

  15. #42

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    Really shouldn't need a raft for printing pla though I'm sure you'll crack it.

    Have you looked at Printcraft? Printcraft

    Ben

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    RTi (18th July 2014)

  17. #43
    RTi
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    For software..

    Autodesk 123D Design

    seems easy to use .. and theres an iPad App for it.

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    Tinker CAD is a very good package although it does have a community Shape generator element. The nature of TinkerCAD is drag and drop shapes along with grouping and it is very easy to use. Some primary schools are using the 3D Printers s part of an Enterprise module. Designing and making key rings and other gifts. Looking at the cost of materials per gram (from the pint software preview page), working out a sell price and profit.

  19. #45

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    Looks excellent
    although it does have a community Shape generator element.
    What do mean by although ???

    Simon

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