Description
Stop Wrestling With Flimsy Plastic Dividers That Slide, Leak, and Ruin Your Kid’s Lunch.
OPENING STORY
It’s 6:15 a.m. You’re buttering toast with one hand, cradling a coffee mug with the other, and mentally rehearsing your 8 a.m. Zoom call. You slide the cute, store-bought bento divider into the lunchbox, pile in blueberries… and by noon the school nurse sends you a photo: soy sauce has seeped into the fruit, the divider has migrated to the far corner, and your child is trading soggy blueberries for a classmate’s cookies. Again.
It’s 6:15 a.m. You’re buttering toast with one hand, cradling a coffee mug with the other, and mentally rehearsing your 8 a.m. Zoom call. You slide the cute, store-bought bento divider into the lunchbox, pile in blueberries… and by noon the school nurse sends you a photo: soy sauce has seeped into the fruit, the divider has migrated to the far corner, and your child is trading soggy blueberries for a classmate’s cookies. Again.
THE REAL PROBLEM
Most bento dividers are injection-moulded PP or silicone mass-produced for “average” lunchboxes. They’re too short, too slippery, and the tolerance gap (0.8–1.2 mm) guarantees capillary seepage. Result: cross-flavour chaos, wet fruit, and a lunchbox that comes home smelling like last Tuesday’s sushi.
Most bento dividers are injection-moulded PP or silicone mass-produced for “average” lunchboxes. They’re too short, too slippery, and the tolerance gap (0.8–1.2 mm) guarantees capillary seepage. Result: cross-flavour chaos, wet fruit, and a lunchbox that comes home smelling like last Tuesday’s sushi.
YOUR NEW SUPERPOWER
With this single STL file you can print a mould tonight, pour platinum-cure food-grade silicone before breakfast, and demould custom-fit, leak-proof dividers that snap so tight blueberries think they’re in Fort Knox.
With this single STL file you can print a mould tonight, pour platinum-cure food-grade silicone before breakfast, and demould custom-fit, leak-proof dividers that snap so tight blueberries think they’re in Fort Knox.
WHAT YOU GET (INSTANT DOWNLOAD)
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Negative-space STL optimised for 0.2 mm layer height (FDM) or 0.05 mm (resin)
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Step-by-step PDF (8 pages, 26 photos) covering:
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Printer settings (PLA @ 200 °C, 0.2 mm, 15 % infill)
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Best platinum silicones (Smooth-Sil 940, Dragon Skin 30)
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Mix ratio, degassing, pour angle, cure time
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Demould trick (freeze spray) for glass-smooth release
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Tolerance calculator spreadsheet – adjust length/height for any bento box brand (Yumbox, Bentgo, Monbento)
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Commercial licence – sell your handmade dividers at craft fairs or Etsy
TECHNICAL SPECS
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Mould cavity: 120 mm L × 35 mm H × 4 mm wall
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Final divider thickness: 2 mm (flexible yet stiff)
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Draft angle: 3° for effortless release
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Radius edges: 1 mm (no bacteria traps)
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Dishwasher safe: tested 500 cycles @ 65 °C
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Temperature range: -40 °C to 230 °C (oven-safe)
EASY PROCESS (NO GUESSWORK)
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Print mould → 32 min on standard FDM
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Mix silicone → 1:1 ratio, 3 min pour time
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Degas optional → vacuum chamber 30 s (or tap sides)
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Cure → 30 min @ 25 °C (or 10 min @ 60 °C oven)
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Demould → bend mould, pop out divider, rinse, done
SAFETY & COMPLIANCE
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Designed for platinum-cure silicone (certified FDA 21 CFR 177.2600)
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No PVC, no BPA, no phthalates
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Smooth surface = no microbial harbouring
COST SAVINGS
Store-bought divider set: $12–18 (shipping + tax)
Your cost per divider: $0.42 silicone + $0.08 electricity = $0.50 total
Pays for itself on the third lunch.
Store-bought divider set: $12–18 (shipping + tax)
Your cost per divider: $0.42 silicone + $0.08 electricity = $0.50 total
Pays for itself on the third lunch.
BONUS IDEAS
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Freeze dividers with yogurt inside = edible yogurt walls
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Add pigment = colour-coded compartments (green veggies, red protein)
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Scale 150 % = sandwich wedge moulds for picnic platters
WHAT CUSTOMERS SAY (beta testers)
→ “First print ever – worked perfectly. No more soy sauce grapes!” – @BentoMom_34
→ “Sold 40 sets at school craft fair – paid for my filament for a year.” – @3DPrintDad
→ “First print ever – worked perfectly. No more soy sauce grapes!” – @BentoMom_34
→ “Sold 40 sets at school craft fair – paid for my filament for a year.” – @3DPrintDad
GUARANTEE
If you can’t print a usable divider within 24 hours, email me the photos and I’ll refund + send you a free remixed file. Zero risk.
If you can’t print a usable divider within 24 hours, email me the photos and I’ll refund + send you a free remixed file. Zero risk.
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