How To Install SKR2 | Wiring & Compile Firmware | Ender 3 Pro Build Series EP5

what's up youtube this is print practical this is build series number five for the ender 3 pro today we're going to be installing an skr 2.0 along with some tmc 2209 steppers so i already have a custom enclosure printed out for the skr2 which relocates the lcd for the ender to the left side of the printer instead of it being on the right i think this is a really clean look and it exposes the skr ports on the side you can see me draw this in one of my other videos i'll put a link if you're interested so like i said before i got the skr2 along with the tmc2209 steppers i got this whole kit straight from big tree tech right on amazon so the first thing we want to do is make sure that the jumpers are in the proper position on the board so let's take a look at that so if we look at the power jumper on the board you can see right here that it is on vdd and the middle pin which is set up for the power supply on the printer that's perfect that's the way we want it now for the stepper motors it has four jumpers on there for the tmc2209s we only want there to be one jumper on this third row so we're gonna have to remove the first second and fourth row jumpers i'm going to do this off camera okay so now all the jumpers are correct these are set up for uart mode for the tmc2209 so as you can see the pins on the stepper motor driver are color coded and they match up perfectly with the board i'm not going to put the jumper on this pin for sensorless homing because i'm going to use my end stop switches that are on the ender 3. all the stepper drivers are now installed properly and the jumpers are set up good let's throw the heat sinks on the top of them and then we'll install the skr into its enclosure heat sinks are all on let's put it in the enclosure so just a fair warning and i've mentioned this in a few other videos but creality hot glues all of their plugs into their motherboard you're gonna have to be very careful and pick off the hot glue in order to get the plugs off the motherboard i don't think it would be productive to show any videos of me unplugging these wires and then plugging them in on the skr2 instead when i edit this i will put together a wiring diagram to show where i plugged everything from the creality 4.2.2 board into the skr2 so in this section we're going to go over all the wires that are plugged into the creality motherboard and where they should plug into the skr2 motherboard please check all the pin outs when you're following this because i don't show polarity in these diagrams and you need to make sure that you don't do anything that would fry the board so here's the wiring for the stepper motors super simple plug and play blue is the x green is the y yellow is the z and red is the extruder so the creality board has a five pin bl touch port while the skr2 has a three pin for the servo and a two pin for the probe if you already have your connectors split out three and two then this is a simple plug and play if not you might have to pop the pins out of the five pin connector and take a 3 and a 2 pin and re-pin them please please please make sure that the pin out for your bl touch matches what it should be in the skr2 wiring diagram because you can easily fry your board this way or fry the bl touch so creality uses a two pin end stop and the skr3 has a three pin jxt port on the board so the best thing to do would to be get some jxt plugs and re-pin the two pin ones to a three pin if you can't do that then it's possible to trim one of the tabs off on the two pin connector to make it fit in the three pin connector and that's also a possibility the park cooling fan is highlighted in blue and it's plugged in the fan zero which is a pwm fan port this allows the motherboard to vary the speed of that fan i didn't think it was important for the hot end fan and for the case fan to be variable speed so i plug those into fan four and fan three because those are just always on fans uh the fan for the hot end on the creality board does not have a two pin connector on it so you might have to get a two pin jxt plug and crimp the wires for that to make that fit into the skr2 the display wire is super simple just take the one from the creality board plug it in the exp1 on the skr2 and you're all good the power wires are pretty self-explanatory just please check the skr2 wiring diagram to make sure that you get your polarities right the hotbed thermistor and the hot end thermistor are super simple they're just plug and play so follow the diagram so i got the skr2 wired up everything looks good there was three custom things i had to do one i put a jxt three pin connector on the bl touch because before it had the little three prong black connector and it doesn't fit nicely into the port the second was that i made a custom power extension cable and thirdly i made a extension cable for the y-axis limit switch because that was not long enough either so one thing i think i'm going to do is i'm going to print a different version of the lid for this enclosure it does fit but it pushes all the wires down pretty hard onto the skr and i don't know if i want that to happen and we're going to go compile the firmware and see if we can get this going so looking at boards.h you can see that there's two defines for the skr 2.0 i know that i have the rev b but if you're unsure big treetech released a statement about the rev a which causes an issue if you're using the tmc2209s it's possible that all the stepper drivers can get blown out if you're using a rev a so just make sure that you know which model you have and if you do have the rev a just do a quick youtube on the rev a with the two two zero nines okay opening up configuration.h from last time we're gonna scroll down we're gonna change the motherboard now to our skrv2 i'm also going to change the name of the printer here we're in the stepper driver section we should use the tmc2209 for each driver type when you get down to z probe options you want to make sure now to undefine this macro which before we on the creality board we were using the z-axis and switch port for the bl touch but now we're actually using the probe port on the skr so we want to undefine this now so scrolling down a little bit further there's an invert the stepper direction section and i believe that you have to reverse these because the two two zero nines uh are in the reverse direction of the old stepper motors that we had in this printer so i'm going to reverse that now so in your advanced configuration file you want to look for this section here you can search for x current and you should be able to find it this sets the current values for your stepper motors and it uses root mean square current so really it just means that whatever current value your motor is rated for if you divide it by 1.414 then that should give you the number that you should put here so that means we're going to use 590 we'll round it up to 5.95 for our motors here and then our extruder motor is different and we're going to put 708 as the current value for the extruder okay so i selected big tree skr2 as my environment so let's try and compile this now okay so the firmware built successfully which is a little scary because i'm kind of just winging this but let's just slap it in the printer and turn it on see what happens all right the screen is up and running exp3 on the screen exp1 on the board i didn't actually pay attention to which port it came out of when i unplugged it but i just plugged it in everything worked already tested moving the axises and all the move i preheated the extruder and i can see that the extruder is running in the wrong direction that's running in the positive direction so i need to make firmware drainage to invert that back okay so i ran into my next issue the sd card board is not working it has an sd card in it but it still can't find it so let's go look through the configuration find out what's wrong recompile the firmware and try it again [Applause] [Music] [Applause] hmm so this is the final revision of the lid that i made for this enclosure first i started out with just a flat lid and that was squishing the wires down too much then i went to more of like a pyramid lid uh excuse the crappy print quality here kind of i printed it like this on the build plate and this was still squishing it down a little bit um and like none of the vents came out properly so now it's hard to see now that it's on but it's got venting on that side it's got the exhaust fan that pulls the air out on that side and it looks pretty good and it gives enough room for all the wires to sit in there properly so that wraps up this video uh the printer is running on the skr2 and it is running very nicely until next time subscribe thanks for watching

Channel: Print Practical

Views: 1,583

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Id: V_tJHKouHAU

Length: 11min 54sec (714 seconds)

Published: Mon Oct 11 2021

Reddit Comments

[u/Sd89d]

Where did you get the design for the case of the mainboard

[u/BigSacZak]

Thanks bro just order skr will be using this as reference!