Originally printed using PLA filament.Press fit but adhesive may be required.Side springs (purple items) help keep cards in holder. Do not use adhesive on these.Resize CardHolderGroupedFront.STL thickness by turning off Lock of Scale Factors, and modifiying the Z value as shown in image. Same for side springs.Resize CardHolderGroupedDowel.STL length by turning off Lock of Scale Factors, and modifiying the Z value as shown in image. Then lay flat for printing as shown in image. Or lay flat first, and adjust the Y to modify the length.If the mini card slot is not required, only print off CardHolderGroupedFront.STL, CardHolderGroupedBackWithOutMiniCardSlot.stl and 5X CardHolderGroupedDowel.STL.