Thursday, November 16, 2017

3D Printed Student Bag Hook V2.0

Challenge: Student wanted to design a personalised bag hook, that would be functional and personalised.   This design was originally created with a 'cone' shape, testing revealed that the bag would simply slide off making the design not work.   This design was created to adjust and solve this problem.
Background: Student was showing creative design instincts having previously been responsible for the jewellery box design amongst others.   The first design had failed, this was an attempt at an improvement to resolve the issue.
Level of Difficulty: Medium.   The design premise is basic, however there has already been a considerable reworking of the original design based around problem solving.  There is another area that requires considerable redesign - as viewed in the photograph above you can clearly see that the screw holes in the base of the plate are 2cm across.  This clearly would not work with anything other than extremely heavy and large bolts, which would not suit the purpose of this design.   
Timeframe: Seven hours - this design should require further refinementm the hook itself at present is 6cm from the base, the purpose could be achieved by having something half this distance. 
Size: The dimensions of the print are a depth of 5mm.   8cm wide, 12cm high.   As mentioned the hook comes out 6cm from the base.   The rectangle is 3.5cm by 3cm with a width of 2mm.   The base plate has a depth of 5mm.  Strength testing is required to see what weights of school bags could be held up and what the timeframe would be.
What we would do differently: The task needs to undergo strength test see what weight of school bag could be held and for what length of time.   The holes for the two screws to attatch to the wall need to be resized and redesigned. 
Next Steps for the Students: To considerably redesign the mounts for the wall and to possibly have a third screw hole at the bottom of the design.   The size of these needs to be refined.   There is a clear need for significant strength testing based on the size of the design, the weight of school bag that it can safely have (relative to the wall) and the length of time it will hold it for, which would be an amazing Mathematics lesson.

Wednesday, November 15, 2017

3D Printed Mouse House - Extended Version

Print showing the entrace to the 'Mouse House'
Background: Student to designed a container that would contain a working mouse trap.  This would protect a domestic animal or young child from setting off the trap accidentally.  This is the second version of this project, with the first featured here on this website (although this was considerably larger).
Background: This was students first individual attempt at 3D Printing by the student who was nine years old.   It was for a showcase (which has featured on a number of projects that have been featured on this site).
Level of Difficulty: Medium.   The design was significantly large (see details of the Printing Time).  The basic shape was from the Tinkercad interface wtih the addition of a hollow out section for the placement of the trap.   This design was printed with an extremely large amount of 'rafting' to allow the shape to be completed.
Timeframe: Twenty-Seven hours.  Given this fact this was a 'one off' print this was acceptable, the print itself could have been resized given the design brief, which would have leant itself to a considerably shorter print time.
Size: The dimension of this print were considerable - 15cm at the height of the roof structure.   The print was 15m long and 12cm wide.   The width of the walls was 5mm thick. 
What we would do differently: The print allowed a student to have his first experience with 3D printing and great a significant design.  The student could have personalised this design with thier name either externally or internally.   The shape/size came about as the result of the students experience with 3D Printers - while it worked it could have had considerable redesigning.
Next Steps for Students: As above - redesigned and personalised.

Friday, November 10, 2017

3D Printed Movember Cookie Cutter

This variation came through Twitter today, combining an idea from a post on this blog to include it as part of the 'Movember' (New Zealand Prostrate Cancer Awareness) idea.  Great stuff Nathan.

Expected Print Time: Depending on Nathan's set up, nozzle size and PLA Filament in use we would expect this print to run in the forty five minute timeframe.

Thoughts: This will allow a group of students potentially to be exposed to 3D Printing, the print time is extremely realistic given the task and its a fantasitc idea to link it in with a relevant fundraising cause.   

3D Printed Presentation Props Part 2

Challenge: As noted previously to enhanee a presentation for the local community and group of schools.  The displays were static and generally two dimensional, by adding 3D figures 
Background: The presentations had the typical 'science fair'/board set up and we were looking at something to enhance the presentation, by adding additional features, in a 3D sense, to improve or have a point of difference.  Due to the auidence (adults) and timeframe the props were for the most part used from a search on Tinkercad.  These were not designed by students - they were created by third parties and re-sized and printed by the students.

 Left: One group was presenting about the 'Pests' in the School area.  They identified that feral cats were one of the creatures and used a 'cat' search to locate this design, which was then increased in size for a ten hour print.
 Left: The 'Pests' group also identified Hedgehogs (which are protected in parts of Europe, but considered a pest here in New Zealand.  This was located from a general search by students on Tinkercad and then re-sized for a ten hour print.
Left: As part of a 'Machine' themed display this student located a series of machine cogs, printed them out and then hung them from the display board to form a border.  Each cog took approximately forty minutes so the tray of nine shown here was six hours altogether.

Tuesday, November 7, 2017

3D Printed Presentation Props

Glow Worm
Challenge: To choose suitable props to enhance a school presentation.
Background: This is another task to enhance a presentation to take place for the local community and a cluster of schools.  The classroom was developing projects based around two similar themes, gaden worms and glow worms.   As a result of conversation with the teachers of the classrooms an offer was made to enhance the presentations by producing 3D printed models that would then be mounted on the boards.   For the 'glow worm' presentation glow-in-the-dark filament was used.   Due to the timeframe available a decision was made to go with pre-produced material, that was not student created.  (this is the second time this has occurred on this blog, the first being the 'rat' print listed previously which is also linked to this presentation.
Level of Difficulty: Minimum, none.   These prints were sourced from pre-produced locations (in this case a generic search on Tinkercad) and not requiring any student created input.  The only factor that slightly complcated matters was the use of glow-in-the-dark filament for the glow worm.  This filament as a general rule is more difficult to print and requires a adjusted temperature and multiply tries to compete successfully. 
Full display, worms in green
Timeframe: Approximately 40 minutes per worm.  They varied in size and as a consequence the time for each individual piece was different.   The times was a minimum required and as a sourced prints, other than altering the size, minimum changes could be made.
Size: As above the size of the worm/glow-worm varies on a case by case basis.  The longest in the series is shown top left, 12cm.   The worms featured in the display on the right at right angles were this size but split in half due to the angle of the bend.
Collection of 'Tinkercad Worms"
What we would do differently; If time had not been a constraint then it would have been preferable for students to design and create their own individual and unique worms.  Given what students have produced in the past, this would have been more than possible.  On a positive - two furher teachers were provided with practical examples of something produced with 3D Printing, and their displays were enhanced.
Next steps for students: The obvious  is for the students to design the worms or animals from scratch.  This would be well within their capabilities and the animal shapes and design could be inspired to create their own versions that would more than suit the purpose.

Sunday, November 5, 2017

3D Printed Glow in the Dark Container

Container with lid
Challenge: To produce a working container for a School display that is functional and able to store items.   Glow-in-the-dark filament was used to create a point of interest/wow factor.  Container would need to feature a working lid that worked in conjunction with the base.
Background: Group was looking for an item to feature as part of their display for a school and cluster (group of schools) showcase taking place for the parents and local community.    The students had a background in design using Tinkercad having spent most of the year working on the projects featured on this site.  Students were nine and ten years old.   Design was created using Tinkercad and Cura for Printing.
Level of Difficulty: Low.  The students design was complicated only by the filament used.  With our experience with the glow-in-the-dark-filament, instead of regular PLA the quality of the print tends to be compromised slightly, we have investigated changing the print settings but tend to get more challenged prints.   The basic Tinkercad interface was used to produce the base, the lid, the drop
Filament 'burn' shown on container
down lid on the inside and the handle.  We ran the print twice to get a better result from the filament with exactly the same design and settings (this was the first of the new roll of filament).
Timeframe: Six hours.   Print times are exactly the same regardless of the filament used.  The shape could have been slightly refined depending on the purpose of the container of what it was holding.
Size: The base design was 8cm across and 8cm high.   The width of the internal walls was 5mm.   The lid had similar dimension being 7cm across, a 1cm depth in total (including 5mm drop down lid) the handle was 3cm high.    As noted these dimensions were created by the students with the design of the container in mind rather than specific for the project.
What we would do differently: The name of the students and the group that they working as part of could have been included in the design - the lid itself while it had a drop down aspect fitted losely.  Both these things could have added considerably to the design and the project. 
Next steps for students: Research the temperature settings for Glow-in-the-dark filament and then experiment with alternative temperature to reduce the 'burn' part of the printing process shown.   As noted above the container could have been more personalised. 

Saturday, November 4, 2017

3D Printed Mouse Trap House

Mouse House with trap insert visible
Challenge: To produce a 'Mouse Trap House' that is a structure built to hold a mouse trap to ensure that it can still activate but isn't able to be accessed by a third part such as a pet or young child.
Background: Student was producing a 3D print for the first time as part of the a class project for a showcase that is taking place involving a group of local schools.   Class and students had been looking at mouse traps and determined that if an animal was able to access them or a child was able to access them easily then they could be dangerous.  The solution was to create an orginal design that was capable of housing the Mouse Trap itself, allowing the mechanism to fully operate but would not allow the trap to accidently set off.
Level of Difficulty: Medium.   The design was complicated by a significant internal aread that needed to be able to house the mouse trap, with enough space for the trap to be able to spring, with the trap fitting inside it.  This required the removal of considerable rafting from inside the design.
Timeframe: Ten hours of total print - the design could have benefitted from slight revision, however the internal mechanics of mouse trap and the housing goal determined a lot of the shape and size.  There could have been less infill with the design.
The Mousetrap used in conjunction
Size: The base of the design was 7cm across,   the height of the design was 6cm, the thickness of the sides throughout the design was 5mm (which is pretty much the minimum required to make this print successful).   The length of the design was 6cm.   The variations and specifics of the design were based to house and keep the mousetrap - which was a 'The Better Mousetrap By Intruder' brand of plastic, spring based mousetrap.   This mousetrap is quite sensitive and one of the issues with it is that it could easily be set off by movement.
What we would do differently: The challenge for the student was to build something that works in conjunction with a particular  brand of Mousetrap.   Testing is required to ensure that enough space has been produced/created to allow the spring and the trap to fully set and then release when the pressue plate is touched by a mouse.
Next Steps for Students: This project is going to undergo testing as described above to ensure that it is still able to function.  The idea is innovative and creative and addresses a specific problem related to the use of the mousetrap and has been student driven, created and produced - a great result.