Why four holes this far apart
Racks sized for a household set space their holes 20 to 28 mm apart, which suits slim handles. The large tools of a set are the problem: a long slotted driver for stuck screws, a heavy cross-head, a pry-type driver, a wood chisel. Their handles are 32 to 36 mm across, and in a standard rack they either take two places each or do not go in at all. This page gives those four tools a rack of their own. At 38 mm from centre to centre, handles up to 36 mm hang side by side with a couple of millimetres between them.
What to measure
Take two readings from each tool: the shaft just below the handle, and the handle at its widest. The hole must pass the largest shaft and stop the smallest handle. A 10 mm hole takes shafts up to about 8.5 mm, including hexagonal shafts measured across their corners. For the spacing, use the widest handle plus 2 mm. Then check the depth: the holes are centred 18 mm from the back wall, so a handle wider than 36 mm touches the wall and the tool hangs at a tilt; for those, raise the rack depth so that the shelf is as deep as the handle is wide.
Shelf, back wall and material
The shelf is 6 mm thick, a millimetre more than on the longer racks of this site, because four large tools weigh as much as eight small ones and hang further from the wall. It reaches 36 mm out from a 4 mm back wall that stands 32 mm high. Two 4.5 mm mounting holes sit 19 mm from each end of the back wall. PETG is the better material: it bends before it breaks, where PLA snaps at the corner if a heavy tool is dropped into its hole. The rack is plastic and is not load-rated, so keep hammers and wrenches elsewhere.
Printing
Print the rack resting on its back wall with the shelf rising from the bed. The footprint is 152 by 32 mm and the part stands 40 mm tall. In that position the layers run unbroken through the corner between shelf and wall, the place where a rack printed flat would crack. The tool holes lie on their side and, at 10 mm, bridge cleanly without supports. Use four or five perimeters and at least 30 percent infill; strength at the corner comes from perimeters, so add walls before adding infill.
Outline drawing
To scale. The first and last hole centres are 19 mm from the ends.
Parameters the generator will use
| Setting | Link parameter | Value |
|---|---|---|
| Model | model | screwdriver_rack |
| Number of holes | count | 4 |
| Hole diameter | hole_diameter | 10 |
| Hole spacing, centre to centre | spacing | 38 |
| End margin, hole centre to end | end_margin | 19 |
| Rack depth, front to back | depth | 40 |
| Shelf thickness | thickness | 6 |
| Back wall height | back_height | 32 |
| Back wall thickness | back_thickness | 4 |
| Mounting screw hole diameter | screw_diameter | 4.5 |
| Mounting screw holes | screws | 2 |
All lengths are in millimetres. Outer size from these values: 152 x 40 x 32 mm.
Open the generator with these values
This model needs the $7 licence key: one payment, one key, and it opens all five paid models. Get a licence key on Gumroad ($7)
The screwdriver rack needs a licence key: without one the generator shows the model locked, lists the values from this link and fills them in as soon as you unlock. The fitted drawer organiser bin is the free model and downloads with no key.