3D Printing · OpenSCAD · Raffle Hardware · AI-Assisted Design
#FPD — Forced Participant Dispersion.
Hand-shaking a bucket full of thin raffle tickets turns out to be surprisingly bad at breaking up clumps. The obvious solution was therefore a cordless leaf blower, a custom bayonet receiver, screened exhaust vents, anti-ingestion baffles, heat-set inserts and reusable drill fixtures.
How this escalated
The problem
Thin tickets tend to travel as little packs instead of redistributing cleanly when a bucket is shaken. The Haboob uses short bursts of high-volume airflow to lift the ticket mass, break up clumps and let everything settle before the next pulse.
A removable lid assembly turns an ordinary 2-gallon bucket into a purpose-built mixer without permanently sacrificing stackability.
The receiver was designed and physically fit-tested around the RYOBI 18V ONE+ HP Compact Brushless 220 CFM Blower, model PSBLB01B.
Hardware
The final system is a mixture of printed and non-printed hardware. Most of the complexity came from making the lid removable, vented, repeatable and resistant to eating raffle tickets.
The bayonet receiver locks the RYOBI blower into the lid and can be removed when the event hardware needs to disappear back into storage.
The removable threaded locknut secures the receiver without permanently bonding it to the lid.
Round mesh vents let the injected air escape instead of turning the lid into the wrong kind of projectile.
The final 82 mm baffles clear the screen tabs, use perimeter ribs and preload lightly against the lid to reduce ticket-ingestion gaps.
M2.5 heat-set inserts and button-head screws replaced hot-glued mounting so baffle height and retention were no longer guesswork.
The reusable template lays out each vent, then flips over and keys into the finished hole to transfer the mounting-hole pattern.
Remove the blower, install the plug and the bucket can remain closed between mixing sessions.
The actual bucket, lid, screens, hardware, tickets and blower got the final vote on every important revision.
Actual build
The page does not need every product photo to tell the story. These are the pieces that best show how the printed components and off-the-shelf hardware became the finished system.
MacGyver Vision System™
Internal video made the airflow behavior visible instead of theoretical. Taping an iPhone inside the bucket showed tickets plastering against the vent screens and slipping into the gaps around early baffles, which directly drove the final cage and preload design.
AI-assisted iteration
AI helped translate measurements into printable geometry, generate and revise OpenSCAD models, evaluate clearances, design threads, bayonet features, baffles and fixtures, and organize the resulting documentation. The printer, the hardware and the actual raffle tickets got the final vote.
Safety matters
Build resources
The repository is the single source of truth for current STL and OpenSCAD files, Bambu Studio project, hardware requirements, assembly instructions, design notes, photos, videos, safety information and license terms.
