I have had multiple issues with the threads on the headrest bolt/mount not printing well or stripping immediately. I managed to print 1 successfully, but I have no clue what I did. It also feels very chintzy, and I bet it will not survive multiple adjustments. I tried printing it with 0.4, 0.6, 0.8mm nozzles, profiles tuned using ChatGPT, on multiple printers (both were printed on the same plate, picture of 2 random ones from unsuccessful attempts). Every other part came out dimensionally accurate.
I almost wonder if a better design would be a steel bold going through the headrest, and tension achieved by a simple knob with captured nut (ex. this one https://makerworld.com/en/models/1591947-knob-1-4-nut#profileId-1708394). The former would be under the cushion (headrest could be remixed to have it flush with the surface, and than even covered with velcro)
Any input and suggestions are welcome. I’m about to start my second TMT, and would like to figure this out)
this is the first complaint we have had on this part. We will track it, but we wont make changes based on one point of feedback. make sure your layer height is set correctly! I also would not use chatgpt for print settings. It should all work if you follow the presliced files. We also dont want to add more hardware to the build. The entire point is that most of it is 3D printed.
Thank you for your response. I do not expect changes to be made based on this post—I have merely asked for help.
My layer height is correct: 0.2mm on 0.4mm nozzle (default of the file) 0.3 (one and only successful print) and 0.34 on 0.6mm nozzle. ChatGPT is an excellent resource for print settings. It’s not perfect, but neither are all other resources. I have successfully created profiles for multiple filaments, including, but not limited to ABS, ASA and PA6.
“The entire point is that most of it is 3D printed.”–that is completely unnecessary. It has been made very clear from your website as well as the file description.
Not wanting to add more hardware–completely understandable, but also…..you are already acquiring axles, casters, bearings—this is one extra bolt and nut ~.25c, and it can be purchased from the same source as everything else.
Here is another suggestion, that hopefully follows the ethos of this project: make the entire printed bolt threaded, and add threads to the headrest—on the current setup there are 2 thread lines all the way at the end–once they are gone its trash. It’s 3d printed, and it will not add to the material cost.
Is the bolt tight when you insert it into the head rest? From looking at your pics I am wondering if you are over extruding and maybe that is causing some issues for you with this. I have built 3 of these chairs so far and not one issue with the headrest so far. Printed both with a .4 and .6 nozzle.
Ahh ok. Well that makes more sense of why its stripping out. Do you have any kind of hole compensation turned on in your slicer? I am assuming you aren’t using the presliced files in bambu studio?
Since you have bambu printers, I would open the presliced files in bambu studio and print the head rest and screw on your bambu printer and see if you still have the same issue. That will help narrow it down some more.
I have printed it on P1S once with the same result. I also looked at the settings, and they are identical to ones in orca. Thank you for suggesting this though.
Was this printed from Bambu studio or from Orca? I understand the settings are all the same, but they can have differences that are not easily changed sometimes. That was why I suggested printing on a bambu from bambu studio using the presliced files from @MakeGood_Noam
I printed one with the completely standard settings and it worked great. 0.4mm nozzle, dried Petg, 0.2mm layer height. Didn’t feel loose at all.
I have one running right now with a 0.6mm nozzle, 0.36mm Layer height and on Petg-HF settings. The headrest and knob will be done tomorrow and I can share how it feels.
Thank you for all your help! I have printed these 2 parts again and here are the results:
0.4 nozzle/0.2mm layer seem to be producing the most consistent results—I am not sure why the first time I printed it it did not work, but I was unable to replicate this issue across multiple printers. @MakeGood_Noam
However, I still believe that these parts need to be re-designed. Having only 2 threads all the way on the tip of the bolt is not good for longevity, and a few adjustments will most likely strip them. Having this bolt and headrest fully threaded (even with existing size threads) would make this part last way longer.
The headrest screw needs more threads. Once it’s tightened enough to stay up and then you need to move it, it must be tightened to almost stripping. I think it’s too much weight for the few threads currently.
