My build (very slowly progressing)
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@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!
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?
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@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.
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@sepi Great job, your assembly is really looking quite good. Can't wait to see how it will perform.
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@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. -
@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.
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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.
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@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.
@danielfp248 I actually used Kapton Tape but should probably use PP-tape instead.
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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 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.
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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 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.
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@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.
@danielfp248 Good trick, now I only need a syringe.
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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.
@sepi You do need a programmer to flash that. We use a PcKit3 programmer.
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@danielfp248 noooooooooooo. I'll add: replacing it with an esp32, to the list of projects I will never do.
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@danielfp248 noooooooooooo. I'll add: replacing it with an esp32, to the list of projects I will never do.
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Yay, I got my MyStat working (a least to some extent). After fiddeling a bit with the yucky Microchip ISP software of which I had to install an outdated version (3.20 afaik) because they removed PicKit3 support, I finally managed to program Kirk's firmware on the device. Getting to run the python host software was fortunately pretty easy.
At first I was a bit stumped by an error message about an out of range current which I tried to calibrate away. It only occurred to me a bit later to connect the main PSU, which corrected the issue
Unfortunately I have some issues with commands that don't go through like the one for saving calibration to the device returning '?' instead of 'OK'.
Any Idea @kirk ?
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I am less familiar with the MYSTAT hardware/firmware, that repository is a fork and you can see the original developers efforts much before mine! Just to say I'm not super familiar, @danielfp248 programed mine and sent it to me in the mail
Yes, the main PSU needs to be connected for current measurents to function.
Also a warning, make sure the MYSTAT is completely powered off and unplugged before inserting/removing the measurement cable to the MYSTAT, otherwise there is a risk of damage.
Are you following the calibration procedure from the original paper with a (IIRC) 1k resistor?
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I am less familiar with the MYSTAT hardware/firmware, that repository is a fork and you can see the original developers efforts much before mine! Just to say I'm not super familiar, @danielfp248 programed mine and sent it to me in the mail
Yes, the main PSU needs to be connected for current measurents to function.
Also a warning, make sure the MYSTAT is completely powered off and unplugged before inserting/removing the measurement cable to the MYSTAT, otherwise there is a risk of damage.
Are you following the calibration procedure from the original paper with a (IIRC) 1k resistor?
Also actually @danielfp248 made all the code improvements to the repository for MYSTAT, he just dislikes Git and so I'm the one who uploads them
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Also actually @danielfp248 made all the code improvements to the repository for MYSTAT, he just dislikes Git and so I'm the one who uploads them
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@czahl ah I think @danielfp248 would know this answer, he has flashed most of the firmware but I don't remember him saying he made any changes. He is traveling right now so it may take him a bit to get back to us. I have only used the MYSTAT, I haven't dealt with the firmware myself. If he made any changes then we can push them to the repo ASAP.
