Posts made by necrorat

I'm currently running a mini with SBC and would live to be able to use the kusba with, although I have no idea where to even start with the plugin

@dc42 said in hot-plug part cooler fan:

It should be no worse than switching the fan on/off with the mosfet. If you are worried about it, you could connect a resistor of a few ohms in series with one of the wires, for example about 4 to 5 ohms for a 12V fan or 8 to 10 ohms for a 24V fan.

Perfect, ill go with this for now and if i want to get fancy down the road ill look into using a servo to lift it.

https://a360.co/3PVdewf so this is how it stands at the moment only thing thats missing is the cable chain and 40mm fan on the right side of the hotend.

@infiniteloop agin another very cool idea but my hotend is already a thick boy. ill see if i can upload a fusion file of what im working with at the moment.

@phaedrux hmm interesting idea but ideally id like not to have to run more wires to the hotend as its already quite congested. but i do quite like the idea

Im in the process of designing a part cooling fan that is attached via magnets to the hot end that is powered via pogo pins. The idea is i can clip it off to give easy visual access to the hotend and nozzle while the first layer is going down and snapped back on once im happy that everything is running smoothly.

My question is are the fan ports on the duet 3 mini going to be able to handle me connecting and disconnecting the fan with the printer under power? or is this a bad idea and i should just drop it?

@Veti i have been tinkering with the frame and alignment all day. gonna probe the bed one last time then try another print

@Veti so just did a test over 5 point and theses are the results :

2.064
2.068
2.066
2.059
2.046

@Veti so do i have to go though the full calibration procedure for each point that i probe on the bed?

so have just run it again and i am getting quite a large variance now in the region of 0.11mm is this a mechanical issue? the machine is set up on linear rails and i have ensured that they are as square and parallel as possible

@Veti ive wrote it as this to probe 3 times per spot:
G1 Z10
G30 S-1
G1 Z10
G30 S-1
G1 Z10
G30 S-1

@Veti just ran though a 3x3 grid to check and i am consistently getting 2.31 for the trigger height

01/02/2020, 15:16:27 M98 P"0:/macros/probe test"
Current reading 0, threshold 25, trigger height 2.31, offsets X-29.5 Y11.4

@Veti so i measured the z trigger height and it didn't vary by more than 0.005mm at each of the 9 points i measured at, it did vary from point to point but thats kinda the point of bed levelling isn't it ?

@Phaedrux so 1 is the rear right of the height map and 3 is the front centre on the height map. sweet thanks for the tip ill change that out and give it a try probably wont be till tomorrow till ill get to try it now though.

not the best pictures but best i can do at the moment.

the main area is the region 3 threes what appears to be a island where the print head is too far from the bed

@Veti 90% of the bed layer is perfect there are two patches where the gaps are observed so if it was under extrusion or backlash would it not be consistently like that all over the bed with mesh levelling working as it should?

so deleted the file and reduced the number of probe points and it seems to of accepted the file now,but it still seems to be not applying the mesh correctly. there are inconstant very small gaps between the extruded lines in a couple of patches on the bed so that leads me to believe that something i have borked up in my config. ive checked my extrusion multiplier and calibrated my e steps so at this stage it must be something in my config or associated files.

@Phaedrux heightmap.csv there you go mate, appreciate the help so far!

so an update to the issue. spent all of this evening re checking that the machine is as square as reasonably possible and have levelled the bed to as close as i can get it to perfectly flat

but now when i go to load up the height map it gives me the error:
G29 S1
Error: G29: Failed to load height map from file heightmap.csv: failed to read line from file

at this point i dont really need mesh compensation as get ting very nice first layers without the mesh but for completions sake i want to get everything working as intended and iron out the few areas that are slightly more squashed than others on the first layer. should i try reducing the number of probed points to try and get it to accept the height map? or just any steers in the right direction would be highly appreciated.

@Phaedrux so when i home my machine the print head moves to 0,0 which lines up with the printer nozzle being in the bottom left corner. what i wanted to check is that the bed compensation calculations where been done relative to the nozzle not the probe as the probe is offset approximately 23mm from the nozzle. so the above values would of been off but after digging and as you said the calcs are done from the nozzle for all intensive purposes and that is how i have it configured at the moment.