1-12 cell holders for charging 18650-cells

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I needed to charge six 18650 cells simultaneously using my iMax B6 charger. As a newcomer to 3D printing and inexperienced with Sketchup, I recreated the design in Tinkercad with six slots and some additional components. However, these extra parts are not included in the .stl file; only the actual case is provided. The springs were sourced from old single-cell holders, while bolts, nuts, washers, and cable ties use M4 size. Printer settings include a Wanhao Duplicator i3 V2 printer with no rafts or supports, a resolution of 0.2 mm, and an infill percentage of 20%. I have redesigned the model in Fusion 360 based on a video tutorial regarding dynamic design. The updated design has been uploaded for cells one through twelve, with dimensions as follows: size one cell measures 88 x 27.5 mm, size two cells measure 88 x 51 mm, and subsequent sizes add 23.5 mm to the width. If larger sizes are required or a small print bed is used, simply print two versions and glue them together afterwards. A test print of the new design will be uploaded within twenty-four hours; until then, users should proceed with caution when printing.