My build (very slowly progressing)

[kirk]

@danielfp248 said in My build (very slowly progressing):

@kirk Thanks for clarifying kirk, I have the same issue, lol.

I have added a note to the docs on this now!

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Also @sepi I somehow missed reading the main chunk of your thread that you posted several days ago - great work!!

@sepi said in My build (very slowly progressing):

Now I need to be patient about the Pumps from Kamoer which have't shipped yet

@quinnale has also tried some 3D-printed peristaltic pumps in his build thread: https://fbrc.nodebb.com/topic/23/towards-a-working-system

@sepi said in My build (very slowly progressing):

So I finally printed my modified jig in 6h on my kobra max with 1mm nozzle. This made it quick but fugly. You judge for yourself and maybe tell me why my modifications don't make sense.

Can you show the back of your jig? If the rear support doesn't stick out long enough, the entire jig can tip over once the pumps are installed due to a shift in the center of gravity.

Also, it looks cool and wavy! And using a lot less material. Did you modify it in FreeCAD?

[kirk]

@sepi said in My build (very slowly progressing):

I'm more and more considering printing my own centrifugal pump with magnetic coupling. This could also be interesting for the larger models as good pumps seem to be pretty expensive.

If you do, please share the results! This may be very demanding of PP FDM printing (leaktightness, tolerances, etc.). For reference, these are the pumps we are planning on using for the large-format cell (they are likely too large, but the smallest PP, mag drive centrifugal pumps we could find): https://fbrc.nodebb.com/post/30. They were less than 50 EUR each at a quantity of 2 pumps, IIRC.

[sepi]

@kirk said in My build (very slowly progressing):

They were less than 50 EUR each at a quantity of 2 pumps, IIRC.

That's really cheap but you'd still need two variable frequency drives. Nevertheless, it seem like a nice option.

[sepi]

@kirk duh, now I feel like an idiot about that button. I "fixed" my butten by heating it with a lighter and giving it a light squeeze at the end :D.

[sepi]

@kirk about the jig, yeah I modified the FreeCAD version. It's probably prone to tipping. I'll see that once I get the pumps and hobo modify it and then modify my model and share it.

[czahl]

@sepi Great job, your assembly is really looking quite good. Can't wait to see how it will perform.

[sepi]

@czahl Thanks mate! I'll keep you posted. The pumps and potentiostat are in the mail and on their way to my place

[sepi]

@czahl said in My build (very slowly progressing):

@sepi Your PP parts are looking good. Which filament did you used?

https://www.3djake.com/fiberlogy/r-pp-anthracite?sai=12757
It's pretty soft but that might just be PP. I never used PP before. I just selected the cheapest one on 3dJake.

[danielfp248]

@sepi Nicely done! Also don't forget to wrap your screws in packing tape before you assemble the device for testing, otherwise the screws will short the cell.

[czahl]

@sepi BTW, have you done a blow test with your assembled cell? Should be easier now as you just need to blow into one pipe while closing / opening the other one, right?

[sepi]

I've done it with just one flow frame: That seemed to be good. The problem with your proposal is that (at least that's what I think it is) the photo paper is permeable to air. I might put a piece of tubing on the second flow frame to test the seal on the whole cell. Then again, the only real test is to use some liquid. For that I need to wait for those pumps to arrive, which should be this or next week.

[sepi]

@danielfp248 I actually used Kapton Tape but should probably use PP-tape instead.

[czahl]

@sepi said in My build (very slowly progressing):

I've done it with just one flow frame: That seemed to be good.

This sounds great. I also want to do the same then to eliminate as much of uncertainties as possible from the very beginning. It is always frustrating to identify such bugs after assembling everything together. For sure, the final test is the one with the liquids. Looking forward for your first tests with the pumps installed.

[danielfp248]

@sepi If you have an assembled cell with everything except the pumps you can use a syringe to manually pump some liquid through and see if you have any obvious leaks. This is how I normally test cells before I put activate material inside them or cycle water through them using pumps.

[sepi]

@danielfp248 Good trick, now I only need a syringe.

[sepi]

My Mystat finally arrived, yay! No I need to figure out how to flash that pic (hopefully no programmer neede) and get rid of the remaining 5 PCBs.

[danielfp248]

@sepi You do need a programmer to flash that. We use a PcKit3 programmer.

[sepi]

@danielfp248 noooooooooooo. I'll add: replacing it with an esp32, to the list of projects I will never do.

[czahl]

@sepi Good idea, I was also thinking to use a ESP32 with micropython - makes prototyping much easier and if you like you can easily add a simple web UI.