Plano 3600 modular stacking shelf

I resized the thrifty spool shelf to fit my Plano 3600 tackle trays because stacking them high and taking out the bottom one sucked. Original spool holder design was a really nice design because it uses less filament, has channels to stack/join vertically & horizontally, prints without supports. Check out the original for stacking your filament spools! For anyone with bed adhesion issues, I put brim on inside only so that you don't have to post process any bits after removing the brim that might interfere with the connecting parts. I did in PLA & PETG, both work great.