DJD, Where is the RRF documentation for DC42's fork? I've looked at his github, but there's nothing there, not even a pointer to where the actual documentation is. I'm half considering porting it to the Re-arm. I've had a look at the code, but it certainly doesn't look like it has a proper hardware abstraction layer. I noticed a few #ifdef's to do with the RADDS, not really built for portabiby nebbian - General
In the process of setting up my Rearm to be transplanted into my delta, I've been distinctly unimpressed with Smoothie's delta support. For example, you can't put the Z height offset for the probe vs the nozzle into firmware anywhere. And the documentation has a sneering tone to it. It also doesn't support three point levelling on a delta. Not really the best introduction to new firmwareby nebbian - General
DJD, Your numbers are a bit off. I measured about 125 mm/s actual speed on a delta moving down 100mm, using 200 steps/mm on Repetier and RAMPS. Moving up/down is the worst case for a delta, as all motors are maxed out. Using 20 tooth pulleys, 0.9 degree steppers, and 1/16 microsteps is the sweet spot, it gives you 160 steps/mm, top speed of around 150 mm/s, and my print quality is pretty goby nebbian - General
First way to improve: Get 0.9 degree steppers, instead of 1.8 degree steppers. Second way: Get some Panucatt SD6128 drivers. They are amazing. Third way: Get a Duet board that does segment less movements. The explanation for the ripples involves the way that RAMPS firmware segment travel moves into discrete segments, and the way that those segments don't often line up with whole microsteps.by nebbian - General
I've found them to be reasonably close, certainly good enough for this sort of work. On this filament, you can try pushing it down the heatsink and it just gets stuck, cut off a metre, and the next bit goes down just fine. This is borne out by filament diameter measurements. The filament just has inconsistent diameter. You can print fine for half a print, and it will fail. Use the same fileby nebbian - General
Quotenebbian Next up: a flexible fllament test I'd been having loads of trouble with this previously. Well There's your problem. No wonder it was jamming occasionally.by nebbian - General
Quotedrmaestro Congratulations nebbian, excellent modification. I don't have a grooved bearing. Would the following be ok: Link The part needs to be quite strong so your suggestion on using PETG is very sound. Do yo think 20% infill is enough? And a follow-up to my modifications: Yesterday I have printed an object for 4 hours. No clogs or clicking sound, so it probably works. I will test with aby nebbian - General
Nice work DrMaestro! Last night I attacked the filament flattening problem and came up with this solution: More info is here: Running the same test as before, just driving the filament back and forth a few times with lots of tension, resulted in a perfectly round filament with no squashing. I immediately noticed an improvement in print quality. I think it's a very worthwhile change to makby nebbian - General
Just spitballing here... I wonder if you could mount the piezo somewhere on a motor. When the force increases on the belt, it will try to twist the motor on the mount... Might save all that tedious mucking around on the effector.by nebbian - General
Also, I had to reduce my retraction acceleration to 1000 mm/s (down from 5000). The 3:1 gear ratio means that the extruder stepper is accelerating a lot faster than the filament, and high accelerations mean missed steps.by nebbian - General
Quotedrmaestro I actually have a similar setup with 2 Titans (1 is original, 1 is a clone) and the Y splitter. I also use a Prometheus 2.0 hotend. I am actually having difficulties with my setup: I can easliy manually extrude plastic. I can start printing (single or dual filament) without a problem. However I have a hard time finishing prints, as most of them stop due to an extrusion problem. Tby nebbian - General
This page: does not contain the delta tower angle, and delta tower offset config parameters. Took me a while to find them, had to dig through the source code. It needs to show these parameters: delta_tower1_offset delta_tower2_offset delta_tower3_offset delta_tower1_angle delta_tower2_angle delta_tower3_angleby nebbian - Smoothie
Got everything working now. Trap for young players: if you notice that one of the web interfaces wants to use a file called "config" without the .txt suffix, and you put one onto the SD card, and you then try modifying config.txt, then the .txt file is not read on startup. Blech. Attached is my config for a delta. Not tested in a printer, but everything seems to work on the bench, includingby nebbian - Controllers
I've enjoyed the smoothie documentation so far, but now it's time to ask a question in the forum. When replying to a topic, I'm told that I need to log in. OK, how do I register? I've looked and looked, but can't find anything. I also can't find a way to search the forum. Posting here because... well... I can't post on the smoothie forum Edit: It seems I can register as a wikidot user,by nebbian - Smoothie
Has anyone gotten the SD card on a graphic display to work? I've been playing around with it, it just doesn't seem to get recognised. I'm also surprised that the smoothie devs seem to think that printing via SD card on the panel is unreliable. I've been printing for years on my RAMPS setup, using the SD card on the panel, with no issues.by nebbian - Controllers
Well I got my Re-Arm working on the bench today. The cable that Panucatt sell for the graphic LCD has both keys on the wrong side. This wouldn't be an issue if it didn't have the extra 5V line hanging off... but it's there. I had to cut off both tabs and flip both connectors. Then the display worked fine. I have to say that the menus for Smoothie is not a patch on Repetier. Quite a step bacby nebbian - Controllers
Quotedc42 Initially I used the old arms, effector and carriages after upgrading the frame and changing to linear rails. The auto calibration deviation (using 9 peripheral points, 3 points at half the build radius and the centre) halved from about 0.1um to 0.05um. But I hadn't yet adjusted the Z probe trigger height corrections to account for the effector tilt being lower than before. Had I done tby nebbian - Delta Machines
Which side is the front? You might have issues with access with the current setup.by nebbian - General
Does anyone else think that it might be something to do with back EMF from the motors? If these drivers don't have good protection diodes then perhaps when manually moving the head around it might have damaged something in there? What I find strange is that they seem to work fine for a week or two, then start degenerating. If it was purely cooling/overcurrent I'd expect them to fail after theby nebbian - General
I'm glad I'm not the only one! Mine were blasted with a 40x20 blower fan right on top of them. Power supply set to 14 volts or thereabouts. I can't think of anything that might cause such an issue.by nebbian - General
I'm not feeling the love with my TMC's. After a couple of slight layer shifts (one step, on one motor, on a 2 hr print) I dropped the VRef on spreadcycle mode to 1.0 volts... disaster. Lots of layer shifts. So I went back to stealthchop... and again, lots of layer shifts. I'm back on A4988's again. I think the TMC's are a great idea, but they do seem a bit fragile. I'm starting to see whaby nebbian - General
Another popular option is the Smoothie board:by nebbian - Delta Machines
Yes you can, you just need to make sure that the bowden tube can easily reach everywhere that the printer head can move to (including the limits of X, Y and Z axes). You might need to make a tilting mount for your extruder if your bowden tube gets shorter. Some delta printers use something very similar, called a "Flying extruder". The shorter the bowden tube, the better control you have over tby nebbian - General
After this happened: I went ahead and soldered that bridge that olampe posted. It definitely changed something, and I'm pretty sure that this changes the drivers from stealthchop to spreadcycle. I kept the current at the same value (1.3V). I know what you mean about canaries on ecstasy! It sounds like a very high pitched warbling, maybe 15 khz. Definitely not silent. The behaviour was simiby nebbian - General
OK we have our smoking gun. The only difference between these two images was setting the segments/second to be 120 and 60 respectively. Funnily enough I prefer the look of the 60 segments/second print. Perhaps this is due to, as you say, having to round off the microsteps at the segment boundary. I think I've reached the limits of how far I can push this RAMPS board. It's been fun, andby nebbian - General
Quotedc42 The delta support in RRF has always been segment-free. When I implemented delta support in RRF, I considered that segmentation was a nasty hack and I decided to do the kinematics properly. Using an extrusion width of 0.45mm and layer height of 0.25mm, the steps/mm for extruded filament out of the nozzle is about ((0.45 * 0.25) / (1.75^2)) * extruder_steps_per_mm, which for my printer iby nebbian - General
Thanks for that DC. I assume the firmware was segment free at that stage? It looks like the larger stripes on my print might be the segments at play. Your print has the same micro stippling pattern, possibly to do with the extruder motor. I'll have a bit more of a play around with some settings.by nebbian - General
Quotesungod3k Mine arrived today and im looking for a ramps delta sample config. I only could find the Cartesian sample here . Funnily enough I was in the same boat last night. I mashed together the sample Re-Arm config with the sample delta config. It's attached. Note that this is untested, and may cause your house to burn down.by nebbian - General
Here's the STL if anyone's keen to try to replicate this. Probably more applicable to deltas than anything else.by nebbian - General
Here are some tests. This is a 50mm cube. All were done in spiral vase mode, in the same roll of black PLA, at 50 mm/s. I had to lower the minimum time per layer to 4 seconds to get the speed up to 50 mm/s. The first picture is from a Kossel XL, using Repetier / Ramps / 1.8 degree steppers / DRV8825 at 32 microsteps. Steps/mm on this printer is 200. The moire pattern is very obvious, and droby nebbian - General