40x40mm 3d printer fan to 33.5mm Inner diameter abs pipe adapter

40x40mm 3d printer fan to 33.5mm Inner diameter abs pipe adapter

thingiverse

I designed this to adapt a small fan to circulate air through a coil made out of black abs pipe with an inner diameter of 33.5mm. this is for a compost heat system I am using to heat my greenhouse in the winter. the other square is a lid to secure screen as a filter.

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