Sorting thousands of LEGO pieces by hand kills your profit margins. Every hour you spend digging through bins is an hour not spent sourcing or selling. A custom sorting machine handles the grunt work while you focus on finding rare minifigures and closing deals. We'll walk through building a simple conveyor system that separates pieces by size, color, and type. No engineering degree required, just basic tools and patience.
Choose your sorting method
Start with size-based sorting since it's the most reliable. Gravity-fed sieves work better than complex mechanical systems for most resellers. You'll need different mesh sizes: 1x1 pieces, 2x2-4 pieces, and larger elements. Skip color sorting for now since the optical sensors cost more than your time savings.
Essential parts and materials
Grab these from your local hardware store: plywood base (24x36 inches), adjustable-angle aluminum rails, fine mesh screens in three sizes, small DC motor with variable speed control, rubber conveyor belt material, and basic wiring supplies. Budget around $150 for materials. Skip the Arduino controllers you'll find in online tutorials. Simple mechanical sorting beats over-engineered solutions.
Build the conveyor system
Mount your motor at one end of the plywood base. Attach the belt between two rollers, spacing them 18 inches apart. The belt should move pieces at walking speed, not race car speed. Too fast and pieces bounce out of the sorting zones. Add low side walls using 1x2 lumber strips to keep pieces contained.
Create the sorting stations
Position your mesh screens at 30-degree angles along the conveyor path. Start with the finest mesh for 1x1 pieces, then medium for standard bricks, and coarsest for large elements. Each screen needs a collection bin underneath. Use clear plastic containers so you can see when they're full.
Test and adjust
Run mixed LEGO pieces through your machine in small batches first. Adjust belt speed and screen angles until you get clean separation. Most pieces should sort correctly on the first pass. Pieces that don't fit any category collect at the end for manual sorting.
Maintenance tips
Clean the screens weekly to prevent clogging. Check belt tension monthly. Keep spare rubber belt material on hand since it wears out faster than other components. Oil the motor bearings every few months to maintain consistent speed.
Related reading
FAQ
How much time does a sorting machine actually save?
Most resellers report saving 15-20 hours per month once their machine is dialed in. The time savings depend on your volume, but anything over 1000 pieces weekly makes it worthwhile.
Can I sort minifigures and accessories with this setup?
Minifigure parts work well since they're consistent sizes. Small accessories like weapons and hair pieces need manual pre-sorting since they're too varied for simple mesh screening.
What's the biggest mistake when building a sorting machine?
Making it too complicated. Resellers waste months on color-sorting cameras and computerized systems that break constantly. Stick with mechanical size sorting and add features later if needed.
How do I handle mixed lots with non-LEGO pieces?
Pre-sort by hand to remove obvious non-LEGO items first. Your machine will jam on random toys and broken pieces. A few minutes of manual pre-screening saves hours of maintenance.
Once your sorting machine handles the physical separation, you still need to identify and value each minifigure. Our bulk scanning tool processes hundreds of minifigures in minutes, giving you accurate market values for your sorted inventory. Start scanning free with no credit card required.
