Reaction Ball v2.0
Print Profile(1)
Description
Reaction Ball v2.0 — Printed in Siraya Tech Roamr 85A
Train your reflexes. Outsmart the bounce.
This 3D printed reaction ball is a multi-lobed training tool designed to produce unpredictable, erratic bounces. This forces athletes to track, react, and respond in real time. Whether you're a hockey player, martial artist, tennis player, or just want a serious coordination challenge, this ball will keep you on your toes.
What Makes This Design Different
This model is sliced with zero perimeter walls — a deliberate design choice that replaces rigid shell layers with pure infill structure. Combined with Siraya Tech's Roamr 85A foaming TPU, the result is a ball with outstanding energy return and a natural, rubber-like feel on impact.
Supports have been tuned for clean, easy removal — no digging required.
The no-wall approach is critical. Adding walls will make the ball too stiff and kill the bounce response. Trust the infill.
Material: Siraya Tech Roamr 85A (Recommended) - Any High Rebound Filament Will Work
Roamr 85A was originally engineered for high-performance 3D printed footwear midsoles — and it turns out that makes it a near-perfect reaction ball material. Here's why it works so well:
- 48% rebound resilience — a snappy, responsive bounce that mimics the feel of professional athletic equipment
- Up to 57% weight reduction via active micro-foaming, giving the ball a lightweight, "air-infused" feel without sacrificing toughness
- Variable hardness from 68A to 85A — dial in the feel by adjusting your print temperature for a softer or firmer response
- Premium matte finish — the micro-foaming creates a fine, non-glossy texture that hides layer lines and eliminates the typical "plastic" look of TPU prints
- Excellent abrasion resistance for repeated high-impact use on floors, walls, and hard surfaces
Other high-rebound materials that work great: PEBA 90A, standard TPU, or any foaming/high-rebound flexible filament in the 85A–95A shore hardness range. The key is energy return — the bouncier the material, the better the ball performs. Avoid PLA, PETG, or any rigid filament.
Print Settings
| Parameter | Value |
|---|---|
| Material | Siraya Tech Roamr 85A (or high-rebound flexible) |
| Wall Loops | 0 ← Do not change this |
| Infill Density | 35% |
| Infill Pattern | Lockedzag |
| Layer Height | 0.2mm |
| Nozzle | 0.4mm |
| Supports | Tree (Auto) — tuned for easy removal |
⚠️ Zero walls is intentional. This is the defining feature of this print — do not add perimeter walls or you will significantly reduce flex and rebound performance.
Printing Tips for Roamr 85A
- Dry your filament before printing — Roamr is hygroscopic and moisture negatively impacts both print quality and foaming performance. Dry at 70–80°C for 4–6 hours. Siraya Tech
- For best results, print directly from a dry box or filament dryer, maintaining humidity below 15%. Siraya Tech
- Do not load through an AMS — feed directly to the extruder.
- Use my settings!
Use Cases
- Hockey, soccer, and lacrosse agility training
- Hand-eye coordination and reaction time drills
- Wall bounce training and solo catch drills
- General athletic conditioning
A genuinely high-performance training tool that proves great material selection matters as much as great geometry. The Roamr's foamed structure and energy return bring this closer to a commercial rubber reaction ball than anything a standard TPU print could achieve. Happy printing! 🏒
License
You shall not share, sub-license, sell, rent, host, transfer, or distribute in any way the digital or 3D printed versions of this object, nor any other derivative work of this object in its digital or physical format (including - but not limited to - remixes of this object, and hosting on other digital platforms). The objects may not be used without permission in any way whatsoever in which you charge money, or collect fees.
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