Murphy the Library Cat (with Secret Book Box) Assembly Instructions

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About: British techie moved to Texas in 2013. Now a full time, freelance artist. Interested in articulation and assemblies. Fan of support-free models. John Joseph Merlin is my hero.



Murphy the Library Cat is a derivative of my original 3D printed cat model "Shrodinky: British Shorthair in a box":

Instructables Schrodinky docs

Unlike the Schrodinky models, Murphy is not a money box. Instead, he sits on a book which happens to be a secret box: it's lid held in place by magnets. He also wears a pair of spectacles (printed in Flex filament) and wears a shirt collar and tie. Originally, Murphy was not published and was used by me as a gift for friends and family only. However, when I took him to MRRF(Midwest Rerap Festival ), he proved very popular with many requests to make him available to the public, so I decided to do just that. Incidentally, that is where his name comes from: MRRF = Murphy.

Murphy has a choice of a plain shirt collar and standard British style school tie or a fancy collar with a bow tie. Due to the way these are designed, the collars and ties are not interchangeable.

Murphy is available in both single and multi material versions. this way, nobody has to miss out

Fully assembled, he is 250mm tall


The largest model in the Murphy assembly is the cat body, the dimensions are:

length: 109mm, width: 138mm, height: 160mm


If your printer can accommodate this then you are good to go!

You can find Murphy here:

https://www.myminifactory.com/users/loubie3d

https://cults3d.com/en/users/loubie/creations

Step 1: IMPORTANT MODEL INFORMATION - PLEASE READ!!

Murphy is a 3D printed multi part assembly and is available in multi and single extrusion versions (although to be fair, the only parts of him that use multi material extrusion are his head and the pages of the book).

He will be available for purchase on MyMiniFactory and Cults3D in the following packages:


  • Murphy the Library Cat: The complete package

    This includes the following:

    All the common files used by both versions of the model:

    Cat body with tie
    Cat body no tie
    Book base and spine
    Book cover
    Bow tie
    Bow tie shirt collar
    Standard tie
    Standard shirt collar
    Spectacles
    Collar peg
    Eye base

    The files for single material extrusion version

    Cat head single extrusion
    Book pages, foil and binding
    Eye pupil single extrusion

    The files for multi material extrusion

    Book pages
    Book Binding
    Book foil
    Eye pupil
    Cat head
    Cat head inner ears
    Cat nose

    If you get this package then you will not need to purchase any others. It includes ALL the Murphy files.

  • Murphy the Library Cat: Single Material Extrusion Only

    This includes the following:

    All the common files used by both versions of the model:

    Cat body with tie
    Cat body no tie
    Book base and spine
    Book cover
    Bow tie
    Bow tie shirt collar
    Standard tie
    Standard shirt collar
    Spectacles
    Collar peg
    Eye base

    The files for single material extrusion:

    Cat head single extrusion
    Book pages, foil and binding
    Eye pupil single extrusion

    Get this package if you have a printer only capable of single material extrusion. It does NOT include any files for multi material extrusion.You will need to purchase these separately.


  • Murphy the Library Cat: Multi Extrusion "Top Up"

    The files for multi material extrusion only

    Book pages
    Book Binding
    Book foil
    Eye pupil
    Cat head
    Cat head inner ears
    Cat nose

    Get this package if you have bought the single material extrusion package and then decide you want to print the multi material extrusion model parts too.

    Please note, you will NOT be able to print a complete Murphy model with this package. You will need to purchase the single extrusion package in addition to get the common files.


MODEL MATERIAL INFORMATION

Murphy can be printed in a variety of materials providing they can be glued together. However, I would strongly recommend that his spectacles are printed a flexible material(there are a variety of these available now). The spectacles are a delicate model and the flexible material makes them durable. They are not glued in and pinch into the fittings on his nose. As a result, they can be removed easily for packing (if you want to send a print to someone) and easily replaced if they are lost. Glued in standard PLA and other materials are more prone to breaking and damage in this instance.

Very little flexible material is used so a sample packet (available from most sellers) should suffice

ADDITIONAL ITEMS

To make Murphy you need a couple of items to complete the model:

  • 4 x magnets(18mm diameter 2mm thickness) you may use smaller but not larger
  • Quick and clear drying glue capable of bonding the material you are printing in.
    (This document assumes you have read and are following the manufacturer's instructions)
  • Elastic bands (very useful for holding things in place whilst glue is drying)

OPTIONAL ITEMS
Should you wish to add whiskers to Murphy you will need to the following

  • Fishing line for his whiskers (12lb fishing line if printing to scale)
  • Scissors

Step 2: Printing Instructions

I am going to include some rough guidelines for printing but it is assumed you know your printer better than I do (particularly when it comes to multi extrusion), so advice will be fairly simple. It is also assumed that you will have your filaments correctly dialed in.

The setting recommendations are just that and you are not obliged to follow them. The table also explains what files are needed for each object

My Murphy cat models were printed on a BCN3D Sigma R19 (using Simplify3D and/or the BCN3D variant of Cura as slicers)

I highly recommend that you have at least 2 shells/perimeters on all components to get the best effect(unless specified otherwise). All files are already orientated for printing.

I'm listing the materials I used in the pictures in case anyone is interested and wants to know where to get them.

Common model parts

Component and File/s needed

Supports

Recommended
Infill

Recommended
layer height

Notes

Cat Body no tie
(murphy_cat_body_no_tie.stl)

No

10-15%

.2 or smaller

This body file is to be used in conjunction with the bow tie and the bow tie collar

Printed in some random cold white I had in my filament store

Bow Tie
(muprhy_cat_bowtie.stl)

Yes

15/20%

.2

You can print this without supports but I like to use a very silky filament and having supports in place improves the quality of the print

Printed in Polyalchemy Elixir PLA Orange

Shirt Collar for bow tie
(murphy_cat_bowtie_shirt_collar.stl)

No

10-15%

.2

I would recommend 3 shells/perimeters as we need a good surface finish.

Printed in Polyalchemy Elixir PLA Silver

Cat Body with tie
(murphy_cat_body_with_tie.stl)

No

10-15%

.2

This body file is to be used in conjunction with the standard tie and the standard tie collar

The body has a recess to allow for the tie to look flush with the body as a real tie would

Printed in Polyalchemy Elixir PLA Merlot

Neck Peg
(murphy_cat_neck_peg.stl)

No

15-20%

.2 or smaller

You will need 3 of these. as they are very small, printing with a brim will help

Any PLA will do, this isn't going to be seen

Shirt collar for standard tie
(murphy_cat_standard_shirt_collar.stl)

No

10-15%

.2 or smaller

I would recommend 3 shells/perimeters as we need a good surface finish.

Printed in some random cold white I had in my filament store

Standard Tie
(murphy_cat_standard_tie.stl)

No

10-15%

.2 or smaller

I would recommend 3 shells/perimeters as we need a good surface finish.


Printed in Polyalchemy Elixir PLA Abyss

Spectacles
(murphy_cat_spectacles.stl)
No100%.2

I highly recommend you print these in flexible material. In my opinion Fillamentum make the best. I use their "harder" flex:

98a Metallic Grey
98a Traffic Black

Eye base
(murphy_cat_eye_base.stl)

No

10-15%

.2 or smaller

You will need 2 of these and I would print with 3 perimeters.

If you are using the multi extrusion Murphy then print in conjunction with the appropriate pupil.

For single just print on its own and we'll fit the pupil later on.

Printed in Polyalchemy Elixir PLA Emerald City

Polyalchemy Elixir PLA Summer Daze

Book cover
(murphy_cat_book_cover.stl)

No

15-20%

.2 or smaller

I would recommend 3 shells/perimeters and at least 6 top layers as we need a good surface finish.

Printed in:

Polyalchemy Elixir PLA Abyss

Polyalchemy Elixir PLA Night Sky

Book base and spine
(murphy_cat_book_base_and_spine.stl)

No

15-20%

.2 or smaller

I would recommend 3 shells/perimeters and at least 6 top layers as we need a good surface finish.
Printed in:

Polyalchemy Elixir PLA Abyss

Polyalchemy Elixir PLA Night Sky.


Multi Material Model Parts

Component and File/s needed

Supports

Recommended
Infill

Recommended
layer height

Notes

Book Base and Spine
(murphy_cat_book_binding_multi_extrusion.stl
murphy_cat_book_foil_multi_extrusion.stl
murphy_cat_book_pages_mullti_extrusion.stl)

No

10-15%

.2 or smaller

If you only have the option of 2 colours, then I recommend a white or cream for the pages paired with a silver or gold for the binding/foil. If more are available then I advise a strong colour which complements your choice for the cover for the binding.

I would recommend 3 shells/perimeters and at least 6 top layers as we need a good surface finish.

Cat Head
(murphy_cat_head_multi_extrusion.stl
murphy_cat_nose_multi_extrusion.stl
murphy_cat_inner_ears_multi_extrusion.stl)
Yes 15-20%.2 or smallerI used a random cold white PLA for his face and Polyalchemy Elixir PLA Bubblegum pink for his nose and inner ears
Eye
(murphy_eye_base_multi_extrusion.stl
murphy_eye_pupil_multi_extrusion.stl)
No

10-15%

.2 or smallerEverything prints in place. Choose a color that contrasts brightly with his fur. Black in advised for the pupil.

Single Material Model Parts

Component and File/s needed

Supports

Recommended
Infill

Recommended
layer height

Notes

Book pages, foil and spine
(murphy_cat_book_pages_
foil_binding_single_extrusion.stl)
No10-15%

.2 or smaller

I would use a white or cream for this.

I would recommend 3 shells/perimeters and at least 6 top layers as we need a good surface finish.
Eye pupil
(murphy_cat_eye_pupil_single_extrusion.stl
No10-15%.2 or smallerThis will just snap into the eye base included in the common files. Generally, I'd print it in black or a colour that contrast well with the eye base but it's up to you.
Cat Head
(murphy_cat_head_single_extrusion.stl
No10-15%.2 or smallerThis was printed using Polyalchemy Merlot

Step 3: Model Assembly: Fitting the Eyes

This is pretty much lifted from my other cat document but I thought it more convenient if I just fold it in here..


You will need printed:

  • 2 x eye models
  • 1 x cat head model
  • Glue

(If you are using the single extrusion eye models, you will need to snap the pupil into the eye. It should fit snugly, but if not, use a little glue).

  1. Put a little glue in the eye sockets and then fit the eyes into the head.
  2. Each eye has a pentagon backing which fits into a corresponding socket in the head. To further ensure correct orientation, there is a dot at the top which indicates direction.

Step 4: Model Assembly: Whiskers

This is pretty much lifted from my other cat document but I thought it more convenient if I just fold it in here..the cat featured here is taken from my other cat models - sorry I was too lazy to repeat taking the pictures...

A cat is not a cat without a fine set of whiskers. Many people had wanted to add whiskers to my original Schrodinky models so for this version, I looked to find a solution using materials that were inexpensive, easy to find and effective. After a bit of thinking and testing, I decided upon 12lb fishing line which scales in perfectly. Get the cheapest you can find it will work just as well as more expensive brands. Unfortunately, though I am very happy with the final results, I would be lying if I said this isn't a tedious job but I think it's worth the effort. If you print the cat larger or smaller you may need to use a different diameter of line.

You will need:

  • 1 x 3D printed cat head with fitted eyes
  • 12lb clear fishing line
  • Quick and clear drying glue which can bond the materials you are using
  • Small scissors capable of cutting fishing line (I used nail scissors)
  • A sewing needle (in case some of the whisker holes are not completely open)
  1. Cut a piece of fishing longer than the desired whisker length.


  2. Feed the line through a whisker hole in the front of model's face and tie a knot at the end inside


  3. Snip any excess line after the knot and then pull the line through from the front of the cat's head until it is stopped by the knot.
  4. Repeat until you have completed all the whiskers on one side.

  5. Pull all the whiskers taunt from the front of the model's face with one hand and apply glue to the knots in the inside. Leave to dry.
  6. Repeat with other side
  7. Once the whiskers are secure and dry, you can trim them.

If you are not sure how to do this, then look at pictures of cats (the internet has plenty). Cat whiskers are never uniform in length and are often shorter nearer the mouth and the top of the whisker pads.

I recommend using a small pair of scissors because it will be much easier to trim individual whiskers.

Step 5: Model Assembly: the Cat

You will need:

  • 1 x printed cat head fitted eyes and (if desired) whiskers
  • 1 x cat body which matches the tie of your choice
  • 3 x neck pegs
  • 1 x shirt collar which matches the tie and body type
  • 1 x tie matching the collar and body type
  • Clear drying glue which bonds the materials used
  • Elastic bands
  1. Take the printed collar and fit the pegs into the holes as shown. These will act as registers to ensure your cat head fits in place.
  2. Glue the collar to the body (there are pegs already in the cat body neck for you to use that match holes in the base of the collar. Use elastic bands to hold everything in place to dry. I have provided pictures of both body and collar types:





    Wait until it has dried
  3. Use the registers in the neck to position and glue your cat head. This can be varied somewhat as shown. Use bands to hold the head in place whilst it dries:


  4. Once the head has been sitting in place for a while, the tie can be added on and secured with bands in addition:

  5. Once the glue has had time to dry well. Remove the bands.

Step 6: Model Assembly: Book and Cat

You will need:

  • Book pages
  • Book base and spine
  • Book cover
  • 4 x magnets
  • Glue
  • Elastic bands
  1. Arrange the magnets in matched pairs. Glue one of each pair of magnets into the holes in the pages of the book

  2. Glue the pages into the Book base and secure with bands and wait for it to dry.

  3. Glue the remaining magnets into the matching sockets on the book cover and secure with bands until they are firmly dried in place

  4. Take the cat model and glue it to the cover using the holes in the cat's feet and the registers on the book cover. Use bands to hold the model together whilst it dries:



  5. Fix the glasses on his nose (do not glue - they will pinch into place) and put it all together. You've finished!!!


Step 7: An Extra Idea....

My mum likes me to make her gifts and so last year I decided to make her the Library Cat. Of course, since it was my mum, I had to make it a bit different so I printed the single extrusion version in wood filament, sanded, primed and then painted it. The spectacles I made from wire.

If people are interested, then let me know and if enough are interested, then I'll write an Instructable:

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    5 Discussions

    0
    None
    Loubie3DSkyfinder

    Answer 5 weeks ago

    Whoops! I updated the document to include the links.

    0
    None
    brianchadorourke

    2 months ago

    Cats are cool. This is cool. I look forward to the next instructable.

    0
    None
    Loubie3Daudreyobscura

    Reply 2 months ago

    Thank you! I have so much fun designing these models, it's always gratifying to find others enjoy them.