Gridfinity sizes
Everything in Gridfinity is a whole number of 42 mm squares. Baseplates are exactly that multiple; bins are 0.5 mm smaller so they drop into the plate with room to spare.
| Squares | Bin (mm) | Bin (in) | Baseplate (mm) | Baseplate (in) |
|---|---|---|---|---|
| 1 | 41.5 | 1.63 | 42 | 1.65 |
| 2 | 83.5 | 3.29 | 84 | 3.31 |
| 3 | 125.5 | 4.94 | 126 | 4.96 |
| 4 | 167.5 | 6.59 | 168 | 6.61 |
| 5 | 209.5 | 8.25 | 210 | 8.27 |
| 6 | 251.5 | 9.90 | 252 | 9.92 |
| 7 | 293.5 | 11.56 | 294 | 11.57 |
| 8 | 335.5 | 13.21 | 336 | 13.23 |
A 2 × 3 bin is therefore 83.5 × 125.5 mm, and it sits in a 2 × 3 area of baseplate that measures 84 × 126 mm.
Gridfinity heights
Heights come in 7 mm units, counted from the bottom of the bin's feet. The stacking lip, which lets another bin sit on top, adds 4.4 mm above that.
| Units | Without lip (mm) | With lip (mm) | With lip (in) |
|---|---|---|---|
| 1u | 7 | 11.4 | 0.45 |
| 2u | 14 | 18.4 | 0.72 |
| 3u | 21 | 25.4 | 1.00 |
| 4u | 28 | 32.4 | 1.28 |
| 5u | 35 | 39.4 | 1.55 |
| 6u | 42 | 46.4 | 1.83 |
| 7u | 49 | 53.4 | 2.10 |
| 8u | 56 | 60.4 | 2.38 |
| 10u | 70 | 74.4 | 2.93 |
| 12u | 84 | 88.4 | 3.48 |
Gridfinity dimensions
These are the numbers in gridfinity-rebuilt-openscad, the reference implementation of the standard. The full library tab above runs that library directly, and the Gridfinity Generator builds bins to the same profile.
| Feature | Dimension |
|---|---|
| Grid pitch | 42 × 42 mm (half grid: 21 mm) |
| Bin base, at the top | 41.5 × 41.5 mm, leaving a 0.5 mm gap between bins |
| Bin outer size | 42 × squares − 0.5 mm |
| Height unit | 7 mm |
| Foot profile | 0.8 mm at 45°, 1.8 mm vertical, 2.15 mm at 45°: 4.75 mm tall |
| Foot, bottom | 35.6 × 35.6 mm, 0.8 mm corner radius |
| Base including bridge | 7 mm (4.75 mm profile plus 2.25 mm) |
| Stacking lip | 0.7 mm at 45°, 1.8 mm vertical, 1.9 mm at 45°: 4.4 mm, added on top |
| Baseplate socket | 0.7 mm at 45°, 1.8 mm vertical, 2.15 mm at 45°, over a 0.35 mm gap: 5 mm |
| Corner radius | 3.75 mm on bins, 4 mm on the outside of a baseplate |
| Magnets | 6 × 2 mm, in 6.5 mm × 2.4 mm holes (press-fit: 5.86 mm) |
| Screws | M3, in 3 mm holes |
| Hole positions | 13 mm from the centre of each square, 26 mm apart |
The one number that decides whether bins fit is the 0.25 mm of clearance per side on the socket walls. A printer that runs a little over-size uses it up, which is why the Gridfinity Generator has a printer-fit setting that corrects for it.
How to measure a drawer
- Empty the drawer and measure the inside width and depth at the bottom, where most drawers are narrowest.
- Measure the height from the floor to the lowest thing the bins must clear: the drawer above, a rail, or the frame.
- Enter the numbers above. Leave the side clearance at 1 mm unless the drawer is very square and smooth.
- Print the baseplates first and test one bin before printing a whole drawer's worth.
What to do with the leftover space
Few drawers are an exact multiple of 42 mm, so there is almost always a strip left over. Up to a few millimetres can simply be left as a gap. Beyond that the grid will slide around, and you have three options: centre the plates and print thin spacers for the edges, print one plate that fills the drawer edge to edge with a solid border (the calculator links you to it when the drawer fits your bed), or use the space for a narrow half-grid strip.
Frequently asked questions
What is Gridfinity?
Gridfinity is an open, modular storage system for 3D printers, created by Zack Freedman. Baseplates divide a drawer into 42 mm squares, and bins of any size in whole squares drop into them. Heights come in 7 mm units. Because every part follows the same grid, bins and plates from different designers work together.
How many Gridfinity squares fit in my drawer?
Take the inside width, subtract about 1 mm of clearance, divide by 42 and round down. Do the same for the depth. A 400 × 300 mm drawer holds a 9 × 7 grid (378 × 294 mm), leaving 22 mm and 6 mm over. The calculator above does this for both directions at once and tells you how to split the plate for your printer bed.
What if my drawer is bigger than my printer bed?
Print the baseplate in pieces and lay them side by side. The 42 mm grid continues across the joins, so two 5 × 4 plates behave exactly like one 10 × 4 plate. The calculator splits the grid into as few, and as even, pieces as your bed allows, trying the bed both ways round.
How tall is a Gridfinity bin?
A bin is 7 mm per unit, so a 3-unit bin is 21 mm and a 6-unit bin 42 mm. A stacking lip adds 4.4 mm on top, making them 25.4 mm and 46.4 mm. With a thin baseplate the bin rests on the drawer floor, so that is also the height it needs in the drawer.
What size magnets does Gridfinity use?
Round magnets 6 mm across and 2 mm thick. The standard holes are 6.5 mm in diameter and 2.4 mm deep for glued magnets; press-fit holes are 5.86 mm. The holes sit 13 mm from the centre of each square, 26 mm apart, which leaves room for M3 screw holes in the same places.
What is a Gridfinity half grid?
A 21 mm grid: every square split into four. Half-grid bins still sit in standard 42 mm baseplates, because four small feet together have the same outside profile as one full foot, and there are half-grid baseplates too. It suits small parts, though the standard magnet pattern does not fit a 21 mm foot.