Free STL files for adaptive switches and switch-modified toys.

What is in the pack

Seven files, every part of a working switch.

• Switch housing, 50mm round

  The classic dome shape. Print in ABS or PETG for durability. Two halves, snap-fit, with a recessed pocket for a 16mm momentary button. About 18 grams of filament.

• Pillow switch shell

  Soft TPU outer shell that gets stuffed with foam. Good for users who need a forgiving press surface. Prints in one piece, no supports.

• Plate switch base

  Flat 100mm square plate with a recessed micro-switch pocket and four mounting holes. Use it on a wheelchair tray, a desk, or a wall.

• Battery interrupter housings

  Four sizes (AA, AAA, C, D). Slide one between the battery and the spring contact in any toy, then plug a switch into the 3.5mm jack. The toy stays original.

• Toy mount bracket

  Velcro-ready strap mount that wraps around small toy bodies. Holds a switch jack steady on the side of a spinning, vibrating, or rolling toy.

• Cable strain relief

  Press-fit grommet for the spot where the cable exits the housing. Stops the wire from breaking after a thousand presses. Tiny, takes ten minutes to print a dozen.

• Wall mount kit

  Two brackets and a spacer. Mount a plate switch on a wall at a comfortable height. Standard #6 wood screws (not included).

Print settings that worked for me

Start here, tweak from there.

These are the slicer settings we run on a Prusa MK4 with a 0.4mm nozzle. Your printer will be a little different. Treat this as a starting point.

• Layer height0.2mm
• Wall count3 perimeters
• Infill15-20%, gyroid
• SupportsYes for housings, none for shells
• Filament (rigid)ABS or PETG, any color
• Filament (soft)TPU 95A, slow print speed
• Bed temp (ABS)100°C, enclosed if possible
• Print speed40-50mm/s, slower for TPU

Filaments we trust at the shop: Prusament ABS, Polymaker PolyLite PETG, Overture TPU 95A. PLA works for indoor practice prints, but ABS or PETG holds up better to a kid pressing the button a thousand times.

How to assemble

Four steps, about thirty minutes.

1. 1

   Print and clean up

   Print the housing halves and any small parts. Clip support material, sand any rough edges with 220 grit. Test fit before wiring.

2. 2

   Wire the jack

   Solder two wires to a 3.5mm mono jack (tip and sleeve). Solder the other ends to a 16mm momentary button. Heat-shrink every joint.

3. 3

   Seat the parts

   Drop the button into the pocket, route the cable through the strain relief, then snap the housing halves together. A dab of super glue holds them for life.

4. 4

   Test it

   Plug into a switch toy or a switch tester. The toy runs while you press, stops when you release. If it stays on, check your wire polarity.

Want a deeper walkthrough? Makers Making Change has full assembly tutorials with photos for almost every device in the open library. Their guides are the standard. Read theirs first if you have never built a switch before.

Why we release these free

The work belongs to the community.

Adaptive switches and toy adaptations are not a market we own. They are a need thousands of families share. The maker community (volunteers, parents, OTs, and engineers running their own printers) built the open-library model first. Posting files for free is how we say thanks. Print a switch tonight for $2 in filament if you can. Want one we already built and tested? That option is here too. Both are fine. Both help.

Or skip the printer

Want one we built for you instead?

Not every household has a 3D printer and a Friday night to spare. Assembled switches start at $30, ship in three business days, and come with a twelve-month warranty. Same files, same housings. Built and tested at the shop.

Take the pack home tonight

Drop your email, get the files.

One email with one link. The PDF guide travels with the files. You can be slicing the first housing in five minutes.