OctoPi produces weak prints

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kenmullins64
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3D Printer(s): Crealtor CR-10

OctoPi produces weak prints

Post by kenmullins64 » November 30th, 2019, 11:44 pm

I have a Crealtor CR-10 and have just migrated to Octopi for wireless printing. Ever since I migrated I am getting really weak prints that crumple in my hand even with 80% infill. There seems to be layers missing so it looks like and extrusion issue. I tried to calibrate the extrusion using this method https://mattshub.com/blog/2017/04/19/ex ... alibration but it didn't want to play. After adjusting the rate of extrusion it either went too far or not far enough.

So to see if it was an issue with the new setup I kept all the same configuration and used Cura 3.2.1 to print to usb rather than gcode file. The results are great from a usb print with the same settings.

What could be going wrong?

As a side note, I wanted to add some plugins to Octopi but it says I have a power issue so won't allow plugin additions. I have tried a number of different wall warts going up to 2 Amps and have even got a USB Volt/Amp display which tells me the Raspberry Pi 3+ never draws more than .8 Amp. Could this be an issue?

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Country_Bubba
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Re: OctoPi produces weak prints

Post by Country_Bubba » December 1st, 2019, 8:25 am

Hi,
I think you nailed it when you talk about the power issue. I was having the same type of things happening and getting the low voltage warning. In my case, I was using a buck converter rated at 3 amps being fed off my main power supply. Used a short (less than 2") micro usb cable to power the pi. Checked voltage at the output of the buck converter and it never dropped below the 5.1 VDC that I had set it to. So ordered another cable with the correct plug on it but with heavier 20 gage wires. Again made the length of this cord as short as possible to minimize IR losses and the problem was solved.

HTH
Country Bubba

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Roberts_Clif
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Re: OctoPi produces weak prints

Post by Roberts_Clif » December 1st, 2019, 8:51 am

I basically had the same problems, although when I printed using Octopi I was using Octolapse.
Other than that I always print using the SD Card.

Maybe if I tried a better Power supply I could get better print results.

Octolapse vs SD card print
Material ABS - Octolapse Left vs SD Card Right.
SD vs OctoLapse 2.jpg

Supply I used was for a Raspberry Pi 5volt 2.5 amp
So do you believe a better supply would make a better print.
Electronics Technician / Computer Programmer

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LePaul
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Re: OctoPi produces weak prints

Post by LePaul » December 6th, 2019, 8:49 am

The right power supply would make some sense.

I know I bought my Raspberry Pi 3's as a bundle with SD and approved power supply
Here's the one I bought several of and suggest to others looking to get into Octoprint
https://amzn.to/2DVKpM8

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Roberts_Clif
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Re: OctoPi produces weak prints

Post by Roberts_Clif » December 6th, 2019, 7:06 pm

I was thinking about adding a 5V Regulator circuit to the 3D Printers power supply.
As do not use a Computer Power supply that comes with a 5 volt supply lead.
Electronics Technician / Computer Programmer

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