Savings Challenge - Piggy Bank/Money Box

🐷 Savings Challenge Piggy Bank — Customizable Grid Box

Turn saving money into a satisfying game! 🎮 Each lid features a grid of numbers that always add up to the target amount — every time you drop in a coin or note, scratch or mark off that cell. Watch the grid fill up as your savings grow. 💰
 

📦 What's included:

• 3 box sizes: 130×200 mm with depths of 80 / 60 / 40 mm
• 1 smaller box: 120×75 mm (great for smaller challenges)
• Lids with targets: €100 / €250 / €500 / €1000
• Compatible with EUR, USD, GBP, CHF, AUD and any similarly valued currency 🌍

🎨 Customization: The label on the lid (e.g. "3D PRINTER", "FILAMENT", "VACATION") and the currency symbol are fully editable in Bambu Studio — just change the text and reset the X axis to center it.
 

🛠️ Want a completely custom grid? Generating a grid where every row sums to the target — while controlling which denominations appear and how often — is surprisingly complex math 🧮. So I built a desktop app that does it instantly. Enter your target, pick your denominations and their frequency, and it generates a valid grid ready to use. I can produce a custom lid for any amount or currency combination on request.

💡 If there's enough interest I'm considering open-sourcing the app so anyone can generate their own grids freely. Let me know in the comments if that's something you'd want!
 

💬 Want a custom version? I can adjust target amount, denomination weights, add/remove specific values, or make it kid-friendly with small coins only. Just leave a comment or send me a message — happy to help! 😊

Inspired by my CZK version which has been popular — this is the international edition based on popular request.
 

🖨️ Printed with two-colour PLA on Bambu X1C with AMS. No supports needed.