Parametric tool rack I designed. I envision using it for sets of small screwdrivers. You can update for your own settings using customizer.

UPDATE: The new version allows for printing without support, and defining different tool slot diameters per row.

Variables are as follows: min_height - This is the height of the first row. height_step - This is how much higher each subsequent row will be. Switch to zero to have the rows level (printable without support). wall - Thickness of the walls of the tool rack. rows - Number of rows of tools you want on the rack. tool_gap - Minimum distance between tool slots (centre to centre, so don't set this smaller than your slot diameters) slot_diameter - Diameter of the tool slots tools_odd - Number of tools on odd-numbered rows. tools_even - number of tools on even-numbered rows. diameter_by_row - A vector containing the diameter of tool slots row by row. e.g. 12,14,20 would make the first row have a diameter of 12, the second row a diameter of 14 and the third row a diameter of 20. Priority is given to this variable over 'slot_diameter', but it will default to 'slot_diameter' for rows where this isn't defined.