Wasn't entirely satisfied with any of the Prusa LCD knobs I came across, so I made my own for CAD practice.

Obviously with the amount of designs out there, other designs probably exist that accomplish these goals, but hey, it was practice.

My oddly specific requirements for this minor part:

• Hole with a fillet that you can stick your finger in and spin quickly but comfortably for large adjustments.
• Hole is close enough to the spoke so you can easily just press down for select without repositioning your finger.
• Ability to use the knob with two fingers/thumb for small adjustments.
• Printable with presenting face on bed for good surface finish.
• Partially blocks printer reset button so a slipped finger doesn't ruin a print, but still exposes enough in case it is actually needed.
• Does not intrude on the LCD in this Raspberry Pi touchscreen panel: https://www.prusaprinters.org/prints/35365-hyperpixel-4-touchscreen-external-lack-enclosure-f
• Can make use of adaptive layer height features in slicers.

Print instructions

Rafts: No

Supports: No

Resolution: 0.07-0.25 (adaptive)

Infill: 10%+

I printed this in Prusament PETG Ultramarine Blue with adaptive layer height, using 0.07mm layers for the top and bottom fillets to ensure clean and safe overhangs, 0.25mm layers for everything between for speed, and 100% as perimeters because why not. With my settings, printed in about 45 minutes.

You can probably get away with 2 perimeters and 10% infill which would print in about 30 minutes, and less still if you just use 0.25mm for the whole print, but I don't know if the overhangs will work.

Use circular or concentric type infills on the bottom layer for a nice surface pattern. If available, paint the seams in the center hole and/or align the seams and post-process.