125mm Sanding Cup for Bowling Ball Resurfacing

This is a custom-designed sanding cup for bowling ball resurfacing and polishing.

It holds a 125mm (5") round sanding pad using hook & loop (Velcro) stickers, keeping the pad firmly in place during use. On the backside, the cup is designed for a 1/4" hex bit adapter, so you can attach it to any drill or driver.

Best used together with a spinning ball cup holder: this way, the drill remains stationary while the bowling ball can freely rotate in the cup, making the resurfacing process smoother and safer.

A great tool for bowlers who want to maintain their equipment at home without the need for an expensive resurfacing machine.

There is also a M10 Nut version, to add different options 

🔑 Features

• Fits 125mm (5") sanding pads
• Hook & loop (Velcro) compatible for quick pad changes
• Designed for 1/4" hex bit adapters or M10 Nut
• Works with drills or drivers
• Perfect for bowling ball resurfacing and polishing
• Works best with a spinning ball cup holder

⚙️ How to Use

1. Place hook & loop (Velcro) stickers inside the sanding cup.
2. Attach a 125mm sanding pad of your desired grit (500, 1000, 2000, 3000, etc.).
3. Insert a 1/4" hex bit adapter in the back of the cup.
4. Mount it onto your drill/driver.
5. Secure your bowling ball in a spinning ball cup holder.
6. Keep the drill steady while allowing the ball to rotate freely for even sanding or polishing.

🖨️ Print Settings

• Material: PETG or ABS recommended (more durable than PLA)
• Infill: ≥15%-40% for strength
• Walls: 4 for strength on the torque
• Layer height: 0.2 mm
• Supports: May be required depending on print orientation

⚠️ Safety Notes

• Always secure the ball in a ball cup holder before starting.
• Use moderate drill speeds (too fast may overheat or damage the pad).
• Wear safety glasses and a dust mask when sanding.