Grippy movement trays for Warmaster miniatures

Are you fed up with miniatures sliding off terrain, but have some flexible (TPU) filament lying around?  Do your miniatures already have magnetized bases?

Here's the solution!  Print movement trays with one (or two) layers of soft filament in a suitable pattern.

The movement tray STL files are a very basic design, the print is configured in the slicer.

You can open the 3MF files I have uploaded, which has all this already:

1. Import the STL
2. Set the printer to have two extruders, with the second containing the flex filament
3. Add a height range modifier for the top layer (e.g. 1.4mm and up), and configure that to
   1. Extruder 2
   2. 30% octogram spiral infill
   3. Top and bottom solid layers zero
   4. Additional (e.g. 3) perimeters
4. Set the Tool Change code.  I needed M104 S240 to set the temperature for the flex filament before the filament is swapped, and M600 to do the swap.  You might need something else, depending what printer you are using. 
5. Slice, and add a pause at the appropriate level to add the magnets

I have added models for different size magnets, or you can customize the OpenSCAD code.  I used 3×0.5mm neodymium magnets from Green Stuff World. The filament is KungFuFlex Soft 85A, the softest one I had, and normal PLA.

If you use this, you'll need to pay attention to the polarity of magnets you add to bases.

Printing with flexible filament is difficult — it is easy to jam the extruder if the printer is not adjusted correctly. I recommend trying a TPU-only print before attempting this change from PLA→TPU within a print.