Add 3d printing notes to README

README.md

@@ -13,6 +13,18 @@ A ruler to help cut the cardboard to size is also included.
 
 <img width=400 src="./doc/ruler_top.png" />
 
+## Notes About 3D Printing
+
+All models can be printed with a 0.6mm diameter nozzle.
+
+For the base models with magnet holes, supports are required. It is recommended
+to
+
+- enable normal (non-tree) supports
+- not support bridges, as this leads to redundant supports for this model
+
+<img width=200 src="./doc/support_settings.png" />
+
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 This project was heavily inspired by