Bear Family Puzzle (5 Members)

Here the steps for my realization (note: Many ways possible, but I did it my way):

1. Take a screen shot from a subject
2. Rework it for high contrast and clear lines
3. Import jpg/png into CorelDraw!
4. Trace it, which means create vector graphics from bitmap; sometimes few trials necessary
5. Cut off stuff you don't need
6. Clean the soplines, remove, add knot points, thus create 6 closed vector elements
7. Export each of the six to SVG format, name them accordingly; also export one complete picture with the six elements. You'll need this for later resizing purposes! SVG don't export always same size, but same proportions
8. Run TinkerCad (TC)
9. Import the six elements, import the complete picture. Select a scale for import that it fits the build plate of TC and your printer
10. Move each element (of six) over the complete picture and resize that it fix until a 10th of a millimeter
11. Once done, select a desired height of each element. I choose 8mm for the large bears (L1 and R1), 7mm for the small bears (L2, R2 and Baby Bear), 7mm for the frame.
12. Best you start a second TC session (#2) and copy/paste the complete picture there. Make a frame around the picture (box) and size it thoroughly. I choose 7mm height. 
13. Now magnify the complete picture by 1-1.5mm in X and Y. Select it a cut-out (not solid) and cut out the complete picture frm the frame.
14. Now rework and finetune the frame by cutting out artefacts, especially the two lower nothces (where the smal bears' legs are divided) shall need some more attention, otherwise the notches will be too wide, cut them all around by 1 mm at least
15. Now copy/paste the frame into the earlier (first) session. Move it that it fits the rest of the family, check the two mentioned notches, probable you'll need to rework this in session #2 and copy back to #1
16. Happy with this result so far, I use to copy this status into session #2, having two bears L1 and R1, L2 and R2, baby bear and the heart, and the frame as well. This will be your backup, incase off any problems!
17. For the noses I took a cylinder, stretched it a bit then used in principle the same model for all noses. Set height of the White to 7.4mm (L1, R1), make a copy and size the height to 0.6mm (I used 0.8mm), paint this black and set it exactly on top of the White nose, which results in a total height of 8mm (7.4+0.6mm)
18. Make the same thing for noses (L2, R2, Baby) but total height 7mm (6.4+0.6mm)
19. Group nose 7mm, group nose 8mm). Make copies and rotate and place them to L1, R1, L2, R2, Baby.
20. Once placed, ungroup each nose, copy the 0.6mm nose tops and make them hole (for cut-off). Cut off nose top (0.6mm) and the appropriate body (L1, L2, R1, R2, Baby). This will make room (space) for the black nose. Group each nose (6.6 or 7.6 and body (L1, L2, R1, R2, Baby). The resul so far should be that you have 5 bodies with inserted nosed each 
21. Next step is to draw the lines for eyes, mouth, lines (arms, legs). Here I used the scribble function of TC, I only made 2-3 scribbles, which I later resized and rotated according to the original sketch
22. I choose the height of 0.8mm (0.6mm will possibly be better) for the scribbled eyes, arm-line, mouth. Form them, resize them, rotate them and cut-out like I did with the noses. The result now should be you have 5 bodies, each body has cut-outs for lines and nose (0.6mm), and you have for each body the nose, eyes, other lines (those in 0.6mm)
23. Now you have the model complete!
24. Carefully select L1 only and export to a stl-file (e.g. Bear_L1_Body), next select nose, mouth, eyes and lines (if appropriate), you can group them or not, but export those as stl-file (e.g. Bear_L1_Black)
25. Repeat this for the other bodies (R1, L2, R2, Baby). The heart will be the easiest stl-file (e.g. Bear_Heart.stl)
26. In your Prusa slicer (others will work similarly) you drag the L1_Body and L1_Black on your build plate, select and assign colors in MMU section, then optionally add a text (e.g. names) and assign this text as a cut-out! Now place the part (body, black, text) on the surface and slice. Check the first layer, if everything is on the plane. Do not select two bodies at once, this may result in inconsitencies of first layer. If you want to print two at a time, drag them sequentially, means one (pair of Body and Black) after the other. Print it out and be happy if the print is like you expected.

I printed this with PLA. Other filaments are possibly good to go too. 

All other bodies on MK3s+ with MMU2s. 
Frame and heart on MK4.

Have fun and happy printing.

Explore my other Printables: https://www.printables.com/de/@Tritschi