Modular Expandable Shaker Style Peg Rack

This modular wall-mounted peg rack was designed around traditional Shaker style peg rails while allowing for fully customizable length and peg spacing through each body piece. The system uses interlocking channel guides so sections can be combined in different orders and expanded depending on the desired layout.

Each standard peg module contains a centered threaded mounting hole designed for a screw-in shaker style peg ball. The entire rack is designed to be assembled without glue, but glue can still be used if the rack will be holding heavier items, or your prints are not as tight fitting as intended. 

The design was originally printed on a Prusa Mini+ using Amolen Walnut Wood PLA.

Piece Dimensions

Standard End Piece

17.5 cm long

Features:

• One channel guide slot

• One countersunk mounting hole for a countersunk M6 screw

• One centered threaded peg mounting hole

Standard Middle Piece

17.5 cm long

Features:

• Bilateral design

• Two channel guide slots, one on each side

• One centered threaded peg mounting hole

Spacer Modules

Short Spacer

10.5 cm long

Features:

• No peg mounting hole

• Bilateral channel guide design

• Used to increase spacing between pegs

Long Spacer

15 cm long

Features:

• No peg mounting hole

• Bilateral channel guide design

• Used for larger spacing sections or mixed layouts

Long Spacer With Screw Hole

15 cm long

Features:

• No peg mounting hole

• Bilateral channel guide design

• Includes a countersunk mounting hole

• Used as a center support section for longer rack configurations

• Helps reduce possible sagging without needing to use a Command strip

I included this version as an optional support piece for longer builds, but I did not use it on my original hanger.

How to Make

Note: All modular pieces are designed to fit together using the same channel guide system. Middle pieces and spacer modules are bilateral, meaning they can connect on either side and be repeated any number of times.

For a standard peg rack:

Print:

• 2 end pieces

• 2 middle peg modules

• Optional spacer modules depending on desired spacing

• # of channel guides depending on if spacers are printed, only 3 needed for 4 body pieces

• 4 shaker style peg balls

Assembly works by sliding a channel guide halfway into one module, then sliding the adjacent module onto the exposed half of the guide. Repeat this process until the desired overall length is achieved, then finish both ends with the end pieces.

The channel guides are designed with a snug friction fit so the rack can be assembled without glue. Because of this, a good amount of force may be needed when pressing the channel guides into the slots. If you plan to hang heavier items, I recommend adding glue inside the channel guide slots and along the mating faces between modules.

Once the body is assembled:

• Install the countersunk M6 screws through the end pieces into the wall

• Screw the peg balls into the centered threaded holes of the peg modules

Important Thread Tolerance Note:

The peg and body threads were designed with a tight tolerance of about 0.2 mm. Because of this, do not use too much force when screwing the peg balls into the body pieces.

If a peg does not screw in all the way and starts giving a lot of resistance, stop forcing it. Screw it in until there is strong resistance, then unscrew it and screw it back in again. Repeat this slowly so the printed threads work into each other until the peg sits flush.

Using too much force once the peg meets resistance can cause the peg or threaded body section to break.

Tolerance Adjustment Note:

This model was designed around my known printer tolerances. If your printer is slightly different, some parts may fit too tightly or may not sit completely flush.

If the channel guides, threaded pegs, or module joints are too tight, adjusting the XY size compensation setting by around +0.1 mm or -0.1 mm may help. A small XY compensation change can make the difference between a press fit and a fit that is too tight to assemble cleanly.

Modularity:

The design allows:

• Any number of peg sections

• Adjustable peg spacing

• Mixed spacing layouts

• Horizontal expansion

• Symmetrical or asymmetrical arrangements

Example configurations:

• Peg every 17.5 cm

• Alternating peg and spacer layout

• Wide entryway rack with grouped pegs

• Compact rack with tightly spaced pegs

• Extended hallway organizer

Because every module shares the same channel guide geometry, the pieces can connect universally.

My Print Settings

I used:

• Prusa Mini+

• Amolen Walnut Wood PLA

• 0.25 mm layer height

• Body pieces printed flat

• No supports for body pieces

• Peg balls printed vertically

• Organic supports used for the peg balls

The wood PLA gives the finished print a texture and appearance closer to stained wood, which works well with the Shaker and Japandi inspired styling.

Mounting Notes

The intended mounting method uses countersunk M6 screws through the two end pieces. Depending on wall material and rack length, drywall anchors or wall studs are recommended.

The longer the hanger is made, the less structurally sound it becomes near the middle. For longer configurations, I recommend adding support in the center, such as a Command strip, to reduce flexing and sagging.

For longer configurations, I also included a version of the 15 cm spacer with a screw hole. This allows the middle of the rack to be mounted directly to the wall, helping reduce possible sagging without needing to use a Command strip. I did not use this piece on my original hanger, which showed no visible sagging with only the two end screws, but it is recommended for longer or heavier configurations.

On my original hanger, there was no visible sagging with only the two end screws and no Command strip support, but this may change depending on the number of modules used, print settings, filament, wall mounting method, and the weight of the items being hung.