Parametric IKEA Kallax Rails for 7x6 Gridfinity Storage Box by Pred

Lightweight, parametric rails for storing Gridfinity bins inside IKEA Kallax cubes. No full shelves needed, just side-mounted rails for smooth sliding and minimal material use.

Bottom bin sits on the Kallax floor, with adjustable rail spacing above.

Created with ChatGPT, and tested and working for my 6x7 boxes by Pred.  The file is highly parametric (maybe too many options?!), but the main ones you’ll want to adjust are:

• Box dimensions

  • box_width

  • box_height

• Kallax fit

  • kallax_inner_width

• Spacing / clearance

  • slot_opening_height

  • vertical_clearance

• Rail structure

  • ledge_thickness

  • drawer_count

• Mounting

  • screws_per_rail

  • screw_end_margin

  • screw_boss_depth

• Optional reinforcement

  • add_diagonal_gusset

• Preview / testing

  • part (left/right/pair/test_column)

  • test_column_depth

 Notes

• Print flat on the bed

• Use test_column first to dial in fit

• Rails are continuous for smooth sliding

• Slot spacing accounts for rail thickness