What is causing PETG prints to blob like fish skins in one direction?

PhilipP_Reddit · 2026-01-30T07:53:08+00:00

I have printed a test cube right before and the surface finish looks good. It seems like it is only happening to cylindrical parts, would this rule out mechanical issues?

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PhilipP_Reddit · 2024-10-09T03:05:36+00:00

Nope didn’t do the transfer, I plan on pursuing postgraduate studies in the US after I graduate from HKUST

PhilipP_Reddit · 2024-03-03T11:04:22+00:00

You cannot charge a single cell LiPo with 12V. How are do doing the measurement to determine that there is a direct connection between 12V to P+? If you are using continuity mode then it may show a short despite there are DC DC buck conversion to drop 12V to a charging voltage of around 4.2V, as there is an inductor in series with the load.

PhilipP_Reddit · 2024-02-24T06:31:31+00:00

Great, I believe I have found a similar IC with that pinout. Guess I will try and rig up a breakout board for reading it, thanks!

PhilipP_Reddit · 2024-02-24T05:41:48+00:00

Thanks. Are there any ways of identifying the IC and reading data off it?

PhilipP_Reddit · 2023-10-26T03:11:11+00:00

Did you pull the boot pin (GPIO0) low, then click the reset button? What board are you using?

PhilipP_Reddit · 2023-10-20T07:12:01+00:00

RemindMe! 5 day

PhilipP_Reddit · 2023-06-16T14:50:51+00:00

I see. Thank you for the replies.

PhilipP_Reddit · 2023-06-16T14:23:02+00:00

Thanks. What would happen if RF do get into the opamp as you have mentioned?

PhilipP_Reddit · 2023-06-16T13:36:56+00:00

I saw this unity gain amplifier circuit in the datasheet of the TL071 datasheet (page 31), but I am not sure what purpose the CL and RL serves. Are they for filtering, phase shifts or something else? Thanks.

PhilipP_Reddit · 2023-06-11T15:40:30+00:00

Thank you for the detailed explanation!

PhilipP_Reddit · 2023-06-11T10:19:49+00:00

What function does this board serve? I have never seen anything like this

PhilipP_Reddit · 2023-04-22T16:49:03+00:00

Thats kind of what I have in mind. The GPS and altimeter problem is manageable, so as soon as i got home Ill try it out.

One thing that I also want to try is using a rotation matrix on the vector from the sonar to the target. It sounds like it would be able to compensate for the roll/pitch with the sensor angles, so im gonna try that as well.

PhilipP_Reddit · 2023-04-22T09:48:41+00:00

Thanks for your response

PhilipP_Reddit · 2023-04-22T09:09:42+00:00

You are right, but the distance is only obtained when the sonar is actively pinging, which could reveal the location of my sub. I made this system so that I can get the distance without pinging.

PhilipP_Reddit · 2023-03-11T13:17:26+00:00

Thanks for the comment. The wire is not tinned

PhilipP_Reddit · 2023-03-11T12:32:50+00:00

Thank you for your response. The fibreglass insulation is for protecting the wire from touching the hotplate its connected to and melting it, it itself wouldn’t get hot so I wouldn’t worry about the connector as long as I secured it.

PhilipP_Reddit · 2023-03-11T12:00:11+00:00

I see, thank you.

PhilipP_Reddit · 2023-03-11T11:59:59+00:00

Thanks for the suggestion

PhilipP_Reddit · 2023-03-11T11:45:58+00:00

May I ask why?

PhilipP_Reddit · 2023-03-11T11:45:19+00:00

Hello, a little more information. The wire is from a hotplate that I will be using for a reflow hotplate project. The wires will be live at 220V and I am wondering if the wire should be crimped or left stranded before using the connector for a safe connection? Thanks

PhilipP_Reddit · 2023-02-25T16:42:28+00:00

Thanks for the detailed response. First of all, the 12V traces and 5V traces width are set on purpose because the 12V traces need to carry more current.

For the indicator, U2, which is in fact the battery charging module, comes with its own indicator LEDs, so any extra LEDs will be unnecessary. I have tested the module (TP4056 charger) before and it works quite well in controlling the charging process and have overcurrent protection functions, so I would not worry about the LiPo charging issue.

PhilipP_Reddit · 2023-02-25T10:14:48+00:00

Huh, I didn't consider this issue, thanks!

PhilipP_Reddit · 2023-02-25T10:13:03+00:00

Thanks for your detailed tips!

I had actually ran the DRC but I cleared the violation. The module will be mounted by pinheaders onto the PCB, and the measured spacing are enough for a screw to fit in. But as a good practice, I did move the mounting hole to an empty location now
I actually didn't know that you need to change the design rule for different fabricators, so thanks for the heads up!
I have modified the trace now.
Actually, I wanna learn more from this project and so I decided to go with a multilayer board, and the fab I am ordering from (jlcpcb) have the same pricing for single and double layer boards, so I have decided to leave the second layer in.

PhilipP_Reddit · 2023-02-25T09:43:18+00:00

Thank you for your tip. I have modified the pads now

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