120 paterson reel chem saver medium format spool filler
thingiverse
This print will save you 125ml of chemicals per spool. This has a tight tolerance designed to fit the paterson reels pictured (I'm not sure if this design will fit other versions of the paterson reel). I recommend printing walls, top, and bottom at least 1.5mm thick (infill at your discretion) Consider exposure testing your choice of printing material to your chemicals before using it in an actual developing process.
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