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this is a useful home-office-school pen holder and case with different sizes:

5x3 (15 pens) 4x3 (12 pens) 3x3 (9 pens) 2x3 (6 pens)

===================print settings=====================

filament: oveture clear pla

infill: gyroid 15%

walls: top,4 bottom,3 side,3

================BOM===================

4x or 2x (depending in how many pens) 5x10mm magnets

                :) :) :) :) :) :)