• 20 Posts
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Joined 1 year ago
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Cake day: July 29th, 2023

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  • I share your curiosity, but I don’t have a ton of time to dig into this right now beyond the thought experiment. That’s the reason for my slower responses :( Work is busy and the kids eat up most of free time.

    You’re right - the seal will directly impact bass. This is why the sound on some headphones will change fairly dramatically as you move your head around - you’re breaking the seal. For me, the head position most likely to break the seal is turning my neck fully in one direction and looking up, but it can also happen with less extreme head motions depending on the cans. I could see volume also playing a role, since the air volume inside the pad is effectively a resonator and changes in air volume will impact how it resonates. I suspect the material of the cup itself will also play a role. Something dense/reflective, like leather, will likely sound somewhat different than say a suede or a microfiber. That was one reason why I was considering gyroid - it would be reasonably non-reflective.

    After measuring my ear and looking at the CAD and print, my first prototype adds enough fore to aft clearance around my ear. It added around 3mm of extra depth. This clears my ear depth by about 1.7mm too far and is primarily from designing in a stiffer material than the original pad. The original pad touches my ear in several places which gets hot and annoying, especially in the summer.

    Sounds like a similar motivator to my “I wish these didn’t press on my glasses frames so hard” ;)

    A pop-tube seems like it would be hard to print vertically oriented. I suspect it would move around some as you’re printing thanks to not being very rigid. It wouldn’t hurt to try it. Printing it sliced down the center and laying across the bed horizontally seems like it would be easier. I certainly hear you on the joys of TPU stringing, but if it’s limited to the far ends of the print it shouldn’t be too horrible to clean up. You could even design it a touch too long and cut the ends off.

    Anyways, if I introduce this disconnected level of complexity to my next iteration, I can likely also add something like a recess for glasses too. I have the same issue with my reading glasses and just use ear buds instead when I need them.

    Depending on the spacing of the tube crinkles, you might be able to line them up so your frames fit between them. You could also probably make one crinkle stick out a little less and line that up with your frames.

    not that you should wait or anything like that.

    At this point, I have nothing but time. I’m also trying out a pair of ‘real’ ANC headphones, vs my office drone headset that happens to have defeatable ANC. They have ridiculously sized pads and they’re actually pretty comfortable with glasses. I am somewhat tempted to type out a mini-review somewhere here, but have no idea where I would post it.


  • I appreciate the detailed reply! You’ve certainly spent more time thinking about this than me.

    My train of thought so far has been, “I wonder if I could partially notch my ear pads to fit my glasses better” -> “I could probably print something out of TPU” -> “I’ve seen gyroid only prints with no walls, varying the infill density could be a halfway decent method for messing with how squishy the print will be and without walls air shouldn’t be trapped”

    On my headphones, the pads snap into the headphones:

    My stock pads are starting to fall apart and I have a pair of replacements on the way, so I am considering disassembling them for their rings and clips and gluing the print to that.

    And you’re right! While I was looking for replacements, I discovered that the stock units are functionally compatible with a bunch of other units although the finish materials are different.





  • Welcome!

    To answer your question, what’s happening is that filament in the meltzone of the nozzle is melting and oozing out after the nozzle reaches temp. It will stop oozing once the tiny bit of filament in the meltzone melts and subsequently oozes out.

    I am not a Bambu user, but if you can preheat the nozzle earlier relative to its wipe you should be golden. It looks like they don’t use Klipper, which means your slicer is probably controlling the order of things. Look at the print start gcode and have it heat the nozzle earlier. If you find whatever it has and copy/paste it here I, or someone else, will tell you what to move.

    Happy printing!








  • This is very cool! Wear glasses and have been tempted to make my own TPU ear pads with some notches to better accommodate my glasses frames. That will obviously nerf the seal some, but it sound be a low cost reversible thing I can try and revert if I don’t like it.

    I was considering printing them with no walls and varying amounts of gyroid infill to get the right amount of squish.

    Be sure to post a follow up and impressions once you’ve used them for a little while.