Macintosh SE Brightness Knob
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The brightness control on a compact Mac is a finger rolling knob that hangs down through a tiny opening under the CRT.…
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- Printables
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- Computers
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- Creative Commons — Attribution
The brightness control on a compact Mac is a finger rolling knob that hangs down through a tiny opening under the CRT. On the inside, the knob is simply attached to a potentiometer at the front corner of the analog board. This knob is missing on the computer I am restoring, so I decided to make my own.
Print Settings
Printer:
Prusa Mini+
Rafts:
No
Supports:
No
Resolution:
.10mm
Infill:
15%
Notes:
I printed with a brim to keep the post part from tipping, but you may not need to.
Assembly
The original part has a post that grips the cylindrical potentiometer stem which has a flat side. This knob itself is hollow, and the gripping post part is recessed up from the knob’s wider rim. This would make for a troublesome print with supports, so I designed it in two pieces that fit together. You can put a few drops of super glue around the post part once you press it into position.
Once assembled, allow the glue to dry, You don’t want to glue the knob to the potentiometer. It is supposed to be a friction fit.
You may need to trim the inside of the post part some depending on your print. You need the pot stem to bottom out all the way inside the knob, otherwise it will sit too proud on the analog board and it will prevent the screw holes from lining up during reassembly of the computer.
You know you have it on far enough when the rim of the knob just barely misses the metal mounting part of the potentiometer (see picture).
Depending on the quality of your print, you may choose to sand the outside of the knob to give it a smoother finish, but honestly, under normal use, you cannot even see this knob, and most of the time it is only used a couple of times to get the brightness set correctly.
UPDATE 2025: More than 3 years ago when I knocked this model together in TinkerCAD, the cone and cylinder shapes had a much lower maximum sides. Today you can bump up the sides to make things perfectly round at this scale. So, I refactored the original from its constituent parts and pushed the sides to the max. I replaced the knob STL with this smoother version. Also added a combined knob-post file which is probably better for resin printing. Enjoy.
The fit is spot on, but it may seem too tight until you put the screws into the analog board. Once the board is held in position, the knob should turn easily. If not, your pot may be misaligned. PLA is not as slippery smooth as ABS plastic, so you can sand around the circumference of the end nub if you want to create more tolerance for a looser fit, but this is probably not necessary. You could also add a dab of silicone grease or dielectric grease to lubricate the plastic-on-plastic where the knob meets the inside of the case.
Category: Computer