I finally have a AA battery tray for my MessagePad 2100! I was able to remix an existing 3D model so it worked with some AA battery springs I already had.
The model is pretty tricky to print and took several tries to get right. It's not perfect but it's working.
https://www.printables.com/model/1368333-apple-newton-messagepad-20002100-aa-battery-tray
#Newton#MesagePad#VintageApple#VintageMac#RetroComputing#3DPrinting