chiz

Yup, it's the first run wizard. Ok, I'll try it and let you know what happens. Thanks a lot! Update: You're right! I need to complete the first run wizard first. After installing custom firmware, I was able to modify the print area settings. Thanks again!

Hi everyone esp. to tinkergnome, First of all, I want to thank @tinkergnome for the great work he's been doing for the community! So, I've upgraded my UM2+ from stock to v17.10.1. After successful firmware upgrade, I get the dreaded "X/Y switch broken" issue. I searched and found out that the stock firmware messes up the EEPROM and one has to do a factory reset first. So I went back to stock, did a factory reset in the printer, did not complete the steps and immediately re-uploaded the v17.10.1 firmware. Still, I'm getting the "switch broken" issue. Not sure if factory reset has to happen "after" the upgrade but I can't do that since the moment I reboot from v17.10.1 I'm immediately taken to default reset routine and I can't bypass it causing the error to occur even before I can access the menu. Any help is much appreciated.

This is the same issue I have that I refer to as below: Issue: X rod crashes to the parked hotend (not yet solved) I also haven't come around resolving this. Curious to know the solution as well.

hmmm... Considering they're only N42 (as the page says and not N52), they're pretty impressive for their holding power. Anyways, yes I ensured that the poles are opposite. I even ensured that the magnet pairs touch each other completely while making sure there's the "air gap" between the head and the coupler. I did do a dry run with the bowden only and without the filament yet. But with the combined bowden+filament, it has become more stiff. I bought a replacement bowden that I've been using on my UMO and has not failed me so far. They're less transparent than what Ultimaker supplies but they're more slippery and less stiff. The tube comes 5ft long so I'll cut the tube slightly longer than stock so it will bend easier.

I'm actually wondering how I'll be able to measure the magnet's pulling force just to be sure. Here's the link to the N52 magnets I bought: http://www.ebay.com/itm/162027521920?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT

Here. (Sorry for the awkward angle. We are moving in a few days and we have boxes with address in the background so I had to rotate the printer preventing the boxes to in the video.) And here's how I mounted the adjustable feeder holder. I even trimmed the bottom screw portion to maximize the angle. [attachment=46958:name] Will probably get back with fixing this issue once we are done with the relocation. Sadly, after I have the Mark2 mod done, I now need to knock down the printer for the move.

Today, I have replaced the head with a new one (printed using Polymaker PC-MAX) with a new set of magnets that's suppose to be N52 rated. Personally, I don't see any difference from the previous magnets that I used. I've also replaced the feeder with the adjustable version. However, my 2nd hotend still falls off when the printhead goes near the extruder (rear right of the frame). I guess I'll be needing a longer bowden tube, or perhaps a less stiffer replacement. Anyways, I calibrate the hotends by eye as I don't pretty much get how calibration works as described in the calibration section in the Mark2 documentation site. I get that the calibration gcode is sort of a "ruler" but I don't get which number I should be keying in the extruder offset. How does -2 value for X corresponds to the circled line in the pic?

I held off printing and testing dual extrusion for the moment as I print a new set of coupling and head (using Polymaker PC-MAX). I noticed however that even if I'm using only one extruder, the 2nd extruder, though parked most of the time, still heats up to 80°. Is there a way to turn the 2nd extruder off completely? Also, can anyone direct me to where I can download the Mart2Tweaks plugin? Tried the forums and google-ing but no dice.

While everyone is probably working on the bugs and without a cheat sheet yet, I thought of compiling the following to help those who may encounter the same issues as they implement Mark2 on their UM2+. Feel free to edit if I misstated anything. Issue: 2nd hotend falls off when printhead goes to the back of the build plate This issue may be due to one or more of the following: 1. weak magnets - You might have used a lower rated magnet, e.g., N35, rather than N52 magnets. Solution: Replace the magnets. Question to dev/proj team: During Mark2 development, was it considered making a feeder design that would freely swing as the bowden tube moves? Do you think it would work as an alternative solution to the weak magnets issue? 2. bowden tube too stiff or not long enough - We want a nice smooth curve on the bowden tube that is long enough to bend with less force. Compared to longer bowden tube, a shorter bowden tube, during bending will have greater force and would push away the attached 2nd hotend causing it to fall off the rod. Solution: Get a longer bowden tube or replace the fixed feeder mount with the adjustable mount version. Issue: Extruder alignments are way off Solution: In the printer control panel, go to Advanced -> Dual Extrusion -> Extruder Offset and set the values to something like X=18.20 and Y=-24.95. Select to keep the values. Issue: 1st Hotend causes belt rattle noise when picking up the parked nozzle Solution: The printhead may be crashing to the parked hotend while picking up the 2nd hotend. Consider adjusting the docking position. In the printer control panel, go to Advanced -> Docking Position. Adjust the X and Y values. Refer to the Calibration section in the Mark2 documentation for the correct position of the heads relative to the magnets. Also, adjust the wiping position. In the printer control panel, go to Advanced -> Dual Extrusion -> Wipe Position and set the Y value to something like 40mm. Issue: Head moving to front left corner causing belt rattle/noise Solution: In Cura, under Travel settings, set Layer Start X to 100 and Layer Start Y to 50 for both extruder tabs. Issue: During wiping, 1st hotend's right fan shroud crashes to 2nd hotend's fan shroud Solution: Adjust the start sequence. In your Cura installation folder, (usually C:\Program Files\Cura 2.5\resources\definitions), edit the Mark2_for_Ultimaker2.def.json using Notepad (or your preferred .json code editor) and look for the string move to the first head. You should be able to find something like the code below: ; move to the first head\\nG0 X120 Y25 F9000; Change the X to a lower value, e.g., X115 Issue: X rod crashes to the parked hotend (not yet solved)

@foehnsturm/@ultiarjan: So I edited the json file directly and adjusted X to 115. It did provide some clearance between the fans. However, with the 1st hotend out of the way, now it's the X rod that's squeezing the parked hotend and causes belt jitter/rattle. Weird thing though is that no matter what value I set to Y, it will not move the X rod farther from the parked head. I tried both small and extreme values such as Y=20, Y=0, Y=30 and Y=50 but it will not stop the X rod from hitting/squeezing the parked hotend.

It's not during docking but during priming. This is after the 2nd hotend has extruded some material, then it gets docked. Then before the 1st extruder extrudes some material, it will move to the front center hitting the parked hotend. See pic below.

@navigator: Yup, I noticed that the "Store" button actually saves the settings even after the machine is turned off Issues Solved Setting the Layer Start X and Y values solved the "front left corner travel" issue. Was able to successfully print the dual color traffic cone below (printed at 60% scale): I think that the calibration page on the documentation should be updated to first set the Extruder Offset X and Y *before* printing the calibration ruler/grid. This ensures that others in the future will not encounter the issues the early modders experienced. Also important to note as well is setting the Start Layer X and Y in Cura. While I still have to dial in my offsets and fix some ooze issues with the hotends, I can say that I've successfully implemented the Mark2 mod. I can't thank enough everyone involved on this project. :)I can now join the ranks of the the first few successful Mark2 modders. @RudydG @qwerty8224 @MarcoUbtz @navigator chiz (others feel free to add yourself to the list) @TheFox: Are you done with your Mark2 mod? One last thing: I've noticed that my 1st hotend would crash to the parked 2nd hotend when it's wiping and I can't solve it even if I set the wiping coordinates farther from the front and more to the left. The 1st hotend will always move to front center slightly crashing to the parked hotend. Is this something that's firmware-specific behavior?

Thanks, @MarcoUbtz! I did notice after backtracking the tread that it was @foehnsturm who suggested the layer start settings. Btw, if you don't mind... Can you tell me how to activate the Mart2Tweaks plugin? I can't find it in the list in Cura and in the Mark2 github repo. I also don't see the "settings" icon as you're showing in this Cura screenshot below:

@tinkergnome: I got the extra head from someone who purchased an extruder upgrade kit to upgrade to UM2+. Replaced the fan shroud and everything else is stock UM2+. Feeder mounted at the back using the fixed extruder mount. I'm considering printing the adjustable version instead. @foehnsturm: Unless the current github files are still not updated. I've just cloned/download the repo yesterday. Rattling/Crashing Noise Solved I solved the rattling/crashing noise and aligned the prints by copying @navigator's extruder offset settings (X 18.20 Y -24.95). See pic attached. Thanks @navigator! Btw, are these settings something that can be permanently stored to the machine? I noticed that it gets reset the moment the machine is turned off. New Issue: Head moving to front left corner I noticed the same thing that @MarcoUbtz reported. The printhead goes to the front left after the 2nd pass/layer causing the 1st hotend to crash against the front panel. This causes the printhead to get out of alignment. Will try @MarcoUbtz' solution to solve for this extra printhead travel.

Pretty much complete with the mod but I'm not having the best of luck to properly calibrate the hotends. Docking works perfectly. I can switch hotends successfully. However, I suspect that I've gotten weak magnets (though its description says they're N52) which causes the 2nd hotend to fall during quick change while printing. Also, I hear ratlling noise the first time the 2nd hotend is picked up. I'm unable to determine the cause yet. I'll describe below hoping someone may be able to help. Below are what I notice when printing dual material: 1. 2nd hotend is picked up. 2. Axis moves to front center and causes rattling noise as if the 1st hotend is squeezing the 2nd hotend against the front panel. (I'm not sure) 3. 2nd hotend extrudes material. Then moves to the left and cuts the extruded material. No issue here. 4. 1st hotend extrudes material. Same, no issue. 5. Attempts to quickly park 2nd hotend misses the slot and 2nd hotend is dropped. Perhaps due to the squeezing/noise prior to this. 6. 1st hotend moves to front center banging to the pard 2nd hotend 7. Attempts to get the 2nd extruder but fails since the head is way off the parked 2nd hotend 8. I manually attach the 2nd hotend to help continue the printing but 2nd hotend prints way too off the expected area to print. When the hotends are closest to the back panel, the bowden pushes the 2nd hotend and gets detached. I had to hold the 2nd hotend just to continue printing. Either I may have gotten a dud N52 or my bowden tubes are too stiff. I've attached pics to show how off the hotends print. This is the calibration print. Trying to print the 2-color traffic cone: