I haven't myself, but Fargo 3d has made some PTFE tube based eyelets that look quite good:by tobben - General
Yup, that's the right lines If you haven't commented out line 435 in Configuration.h, then EXPERIMENTAL_LINE_BUILDUP_COMPENSATION_FEATURE is defined, and STEPS_PER_SPOOL_RADIAN is used, not DEFAULT_AXIS_STEPS_PER_UNIT. For 1/32 stepping, you could use {4866.6, 4866.6, 4866.6, 43799.4} steps per spool radian, but I recommend changing jumper settings instead. Other sources of error makes the difby tobben - General
Did the Benchy come out the expected height, or is it too low? If it is the expected height, then the ABC-motors are letting out too much line, letting your printer move towards the center like a pendulum, when not printing near origo. A wrong d measurment number could be the cause of this, but you would have to be off by several tens of centimeters to have visible effects. If your Benchy is toby tobben - General
The first few centimeters have quite usable print quality, and it did finish =) If layer shifts are paralell with the direction towards an anchor then you probably have missed steps. The shift is large enough to partly explain you increasingly slack lines. Placing the printer in another position than it's internal one (the one it echoes when you send M114) has the same effect as a mis-calibratiby tobben - General
Yup, ABC my lines also get slack at high Zs if I have errors in my anchor location measurements/calculations. Errors in the spool buildup compensation parameters are smaller (< 1cm at Z=1m), but sometimes noticable. I don't know why, but I experience slack lines more often than I experience over-tight lines. I mostly experience calibration errors on weekend, one-off prints at venues and suchby tobben - General
Ow, that's not good. I've only used Octopi with the v3, since it has a stationary RAMPS to connect with. But I know people have set up Pi Zeros with wifi and Octoprint on them, and mounted that on single units too. =)by tobben - General
I'm using Pronterface, and sometimes Octoprint (Octopi), when I run via wifi. BT+Pronterface is better when I need responsiveness, wifi is better for long prints (where I might want to use my computer for other things during print). Does the printer pause and then resume, or just pause? My Bluetooth connection pauses when my laptop runs out of available RAM, and resumes when RAM is available agaby tobben - General
I usually go for some variant of uni knot. This one looks good: PLC might be a good idea for a multi unit design (motors at all anchors), but only if it's easier to set up than bluetooth or wifi communication. I think price and ease of setup would be the most important factors, since speed and reliability requirements would be quite low. We might get away with transfering the full gcode (or evby tobben - General
Oh, the knots. I always often get them on the D-axis too, when moving between different locations with different ceiling heights. FireLine is so hard to knit. Super glue helps.by tobben - General
Oh my! I can't see your pics, but that sounds terrible. Did the lamp hook chew up the fishing line? Why didn't the two other lines (who didn't snap) prevent disaster? This never happened to me, but I've heard about it happening to others, and switched to bearings everywhere on v3...by tobben - General
I also noticed that you swapped s and f when you punched in the numbers (makes no difference for vid, just teasing ) The correct s and f values would not produce NaN, but swapping highlighted a real bug. Published this fix: The v3 doesn't include an extruder like the v2 did since there are no space restrictions. So people can use their favourite extruder or mount clay tool heads if they wantby tobben - General
There's _lots_ of good work packed into that video. I saw that the calculator gave you a #define ANCHOR_C_X NaN or something I thought: "Bug alert! Somebody, get the one responsible for this! Oh that's me." Did your printer move as expected anyways? Love the clip when you're lowering the printer in fast-forward... Looking forward to see your prints =) What are your thoughts on the v3 and thby tobben - General
There: To generate all the stls from the scad-files type 'make' when you're in your hangprinter directory (tested using gnome terminal on an Ubuntu 16.04 box only) ((no need for you to actually do this now, the repo is already up to date)). I hope this reduces the risk of similar bugs returning on me in the future Best regardsby tobben - General
Wow, big respect for the grit in debugging this! You found not one but three potential causes of trouble, two of which are completely new to me. Most people would just have given up. Thanks! Locking up so easily is of course a design bug. I made these two commits to mitigate that: I also noticed that I've used very fragile code to avoid this bug before (see these five lines of code that I'veby tobben - General
Lowering the extrusion rate by ca 1 % will probably helpby tobben - General
Oh no =O Did a larger bottom plate not help at all? Is the worm stuck all of the time, or is it stuck only at certain positions (parts of the rotation)? Pics can help me help you diagnose the problem. (I can't open the close up that you posted earlier anymore, don't know why.)by tobben - General
Nice! To post images, do the following but remove spaces within the square brackets. [ img ]https://lh3.googleusercontent.com/jmpM5TYGUT77WRH0eHyYkFuUTMqd6IbMq_e_Qlf35A6EiZk_ddT5i3x5tWj1RB88i5Mkznpu7x6SueS8cwsvyXSLmVwgwnMwt8mTUpfERmTQBuWvoHzOdAHcuDIcv6JCPeAqFPsEHPfb3kjgTFmCk-GIYaMrkVqlAXWLE9qb8bdiECSYBac37NZPAJJR5I9uBEfR3grYEKv1d_5BPWQQtJqWug-vTL1D9PPMqF9BkeqiRr_Hgv-OjvsQ1sOJ_lR8wM4anOyIZ396T48Rby tobben - General
Don't have any printed bottom plates here, but made a measurement in the Openscad model: This is 204.6 mm.by tobben - General
This is interesting, I don't have much experience with ABS myself. Never experienced problems with PLA frames getting too hot. If I plan on running motors above 50% of their max current, I use washers as spacers between motor and PLA, just to be safe.by tobben - General
But I usually have room to spare around my worms. Your worm looks really well printed. Hm... Mystery.by tobben - General
I sometimes have similar problems because of the significant elephant-foot I give my prints when squishing down first layers. I fix this by cutting away the elephant foot with a knife.by tobben - General
I used PLA... Does your gear teeth tilt the right way?by tobben - General
In what way does it get too tight? Do you have a picture? I vote for rewrappring the line.by tobben - General
Awesome work! I'll probably refer to this vid lots of times. Very efficient explanations! I'm quite impressed that you figured out all that from the fragmented info that I've posted Would it be lots of work for you to flip the D-sandwich in the video (or just put a note there)? I flipped the D-sandwich when I added the worm gear, so most builders will get this wrong, since it's not in the asseby tobben - General
I use Slic3r, although it crashes for me too sometimes... The Babel tower was divided into parts that were sliced individually. Had to change two lines in the source code to make it not center the part or drop it to z=0. Importing a clean mesh minimizes the risk of crash in my experience. PS! I've been playing with the thought of making portable gcode before, here . The benefit would be extraby tobben - General
Very nice and informative video! Thanks for contributing to the community =)by tobben - General
Congrats! Well done Actual XYZ lenghts of lines when printer is in origo is way to go to get the best calibration. Thanks, no problems. Hope it will serve you well, and remember to make one for a friendby tobben - General
Thanks! Very useful to learn how a machine with cm calibration values actually behaves. I bet others will make the same mistake. A 5 mm difference could be from slight mis-calibration or non-flat print bed or both. I've shimmed similar amounts before. Moving your origo a few mm towards the side where nozzle gets low might also help? I think your printer looks like it moves nicely! To get the fiby tobben - General