I made new versions of this and you can find them here:

Version 1: https://www.thingiverse.com/thing:6893297
Version 2: https://www.thingiverse.com/thing:7286510
Version 3: https://www.thingiverse.com/thing:7286518

I was not happy with other people's designs for cable management so I made my own again!

These are 20mm wide and 30mm long. This means most standard sticky tapes fit neatly on the flat side, but they need 60mm length to really grip on tight. However superglue is by far the recommended mounting method.

If you need more length, just stretch it in your slicer.

Print this upright so the layers align properly and allow for maximum strength and flexibility.

These have obvious names based on how wide the cable slit is. In my experience slits easily hold cables 5x their width and they hold cables 10x their width with effort.

I was able to fit anything from 2mm wide USB cables to 10mm wide power cables in my channel. It is just under 10mm tall once laid flat but it should in theory hold onto cables that are 12mm wide. I'm sure it could be slightly scaled in a slicer without issue.

INSTRUCTIONS:

1. Use your cable to push down one lip, then slide it toward the other lip while lifting it slightly. If done correctly, you may hear a satisfying pop.
2. If it’s too hard to insert the cable, try printing a wider channel version.
3. Done.

MOUNTING INSTRUCTIONS:

1. Use superglue or double-sided tape.
2. Superglue is recommended: it's stronger, easier, and causes less damage to desks, walls, or PC cases than screws.
3. If using double-sided tape, you'll need to double the length. This provides enough surface area to keep them attached for a while.
4. Screws can be used, but aren't necessary unless you need extreme stability. To use screws you have to screw in slowly and pull the lips away from the head so they don't break.

PRINTING INSTRUCTIONS:

1. My go-to size is the 3mm slit. It fits all my cables with ease and holds on tight.
2. If you want to do a test fit you can shrink their height and print a few different variations real quick. Start small and work your way up. The smaller the slit the more secure the fit.
3. If you print multiple at once you will need bed adhesion. Probably raft. Alternatively you can set them to print one at a time, which should work great.
4. Adjust the height (AKA length) according to your need.
5. Follow the instructions for your filament or what you've tested works best for it. I use PLA.
6. Done.

My print settings:
PLA.
200 degrees.
.2mm layer height.
1.2mm wall/floor thickness.
.6mm nozzle.
70mm/s (default) speed.
No adhesion (just old glue).
No support.
60 degrees bed.
Printed standing for maximum strength and flex.