Step 1: Import mesh and convert to BREP

Right click on "Document Settings" --> "Do not capture Design History"

Continue.

Design interface: Solid tab: "INSERT" --> "Insert Mesh". Browse to edited .stl --> Open --> OK

Click on map.

Design interface: Mesh tab: "MODIFY" --> "Reduce"

Density from 0.250 to 0.5 --> OK (this is optional, based on your own computer's memory)

Design interface: Solid tab

Right click on model --> "Mesh to BRep" --> OK (this process might take a while)

Right click on "Document Settings" --> "Capture Design History"

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Step 2: clean up bottom layer

Rotate model to see bottom. Click on any bottom face.

Design interface: Solid tab: "CREATE" --> "Create sketch"

Design interface: Sketch tab: "CREATE" --> "Rectangle" --> "2-Point Rectangle"(r)

Create a rectangle larger then model. "Finish Sketch"

Select new rectangle, be sure to also select other bottom face.

Design interface: Solid tab: "MODIFY"--> "Press Pull"(q)

Direction from One Side to Two Sides. Side 1(downward) is ~20mm. Side 2(upward) is 0.3mm.

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Step 3: creating 'cookie cutter' from flat image

Rotate model to see bottom. Click on bottom face.

Design interface: Solid tab: "INSERT" --> "Insert DXF".

Select DXF file. Browse to "puzzleOutline(.3mmClearance).dxf" by MakeAnything (clearance will depend on printer and material used). OK.

Select sketch.

Design interface: Solid tab: "MODIFY"--> "Press Pull"(q)

Select the face of the sketch. Make sure it's not an edge or a small puzzle piece.

Distance from 0.00mm to about -100mm. Wait for extrusion to load. (Make sure the height goes over the highest part of your model).

Operation from "Cut" to "New Body". OK.

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Step 4: editing 'cookie cutter' placement and size

Select the new body. (now calling 'cookie cutter')

Design interface: Solid tab: "MODIFY" --> "Move/Copy"(m)

Z Angle from 0.0deg to 90.0deg. OK.

Select the 'cookie cutter' body.

Design interface: Solid tab: "MODIFY"--> "Move/Copy"(m)

Move Type from "Free Move" to "Point to Point"
Origin Point: inside bottom corner dot of 'cookie cutter'
Target Point: bottom corner of model. OK.

Design interface: Solid tab: "MODIFY" --> "Scale"(s)

Entities: select 'cookie cutter'
Point: click somewhere in the middle of model
Scale Factor from 1.00 to 0.99. OK. (this is done because both bodies are exactly lined up, which won't work in cutting later on)

Select the 'cookie cutter' body.

Design interface: Solid tab: "MODIFY" --> "Move/Copy"(m)

Move Type: "Free Move"

Z Distance from 0.00mm to -2.00mm

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Step 5: cutting the model into puzzle pieces

Design interface: Solid tab: "MODIFY" --> "Combine"
Target Body: model
Tool Bodies: 'cookie cutter'
Operation: Cut
Wait until models turn red. Everything that is red will be deleted. OK. (process will take a long time)

All 130 puzzle pieces will be listed as unnamed bodies on the left. They are in a random order. (I created a grid system with the letters A through J and then 1 to 13. Each piece was relabeled and grouped near it's neighbors. ie.A1, A2, A3...)

Save each piece by right clicking on the named body in the list --> Save As STL

Refinment level is how good quality. High or Medium is fine. OK. (I stored all my A's in one folder, then B's, etc..)