for what it's worth, here's the place of the "wraparound" in a file I sliced in early Feb G0 X116.93 Y13.24 G0 X117.09 Y13.15 G1 F4500 X109.35 Y5.41 E19360.20614 G0 F3600 X109.26 Y5.58 G0 X111.67 Y7.14 G0 X111.79 Y6.99 G1 F4500 X115.49 Y10.70 E19360.48865 G1 F2400 E19355.48865 G0 F3600 X97.16 Y3.40 G1 F2400 E19360.48865 G92 E0 G1 F4500 X96.88 Y3.54 E0.01115 G1 X95.94 Y3.45 E0.04542 G1 X96.32 Y4by rayhicks - Ormerod
If I get time I'll run a test - but last time I ran one that retracted wildly I think it the last positive E position that Cura came up with was around19000mm, then it went to 0.01 ish and climbed it's way up. The firmware coped with the large positive absolute distances fine, it was the (apparent) wrap around to 0 in the gcode that triggered the retraction. Aborting an absolute print then restaby rayhicks - Ormerod
It depends where it falls back to "0" Dave - I managed some small prints from Cura before Cash made his plugin, but at some point during long prints, the E distance dropped back to zero and that triggered the rewind (almost as if there's a wraparound on overflow in the slicer) - it's odd that it works at all frankly, so it looks like the duet is trying to calculate relative E values from the absoby rayhicks - Ormerod
Stu - under printer settings->General settings in slic3r, you need to enable "Use relative E distances" Cheers Ray ps - dc42: have you analysed what it would take to provide support for absolute extruder distances in the firmware? I think it would save a lot of grief for people starting out if RRP or you took a look at itby rayhicks - Ormerod
QuoteMykey If someone can point me in the direction of where to get the extrusions, sliders etc, I may well start to build one of these monsters! Hi Mike, I got my extrusion from here , the sliders are also available there. I've only done a few hours printing on this, all's going well but no long-term guarantees! it might be necessary to use wheels to lower the friction (and chance of binding)by rayhicks - Ormerod
Thanks Radian - I'd idly thought about the Ext_FET connection, but didn't know how best to use it, thanks for pointing out the design issues (I'd have overlooked just about every consideration you raised!). As a further digression, it looks like the copper tape I bought has a resistance of around 0.25 Ohms/M (my bench supply says that it takes 1.5V to push 5.0amps through 1.2 metres of it anywby rayhicks - Ormerod
Good points Mykey , thanks - with an aluminium heat spreader over the PCB's there shouldn't be much difference between a thermistor reading from between the boards and one from the centre of a board I guess, and running a remote relay/s would be easy and cheap for providing power to the boards - I'll certainly give it a go with the two PCBs I have and see how it goes. I've already added header pby rayhicks - Ormerod
Wow - that's like your second print? - Looking very well set up (a whole bed full of flat stuff took me a couple of months at least, and a lot of swearing) ! (and at that rate it'll have paid for itself in no time) Rayby rayhicks - Ormerod
Hi Balidey, not noticed this on Z (though I did get some Z binding when I replaced one of the Z runner bearings to tightly on the X arm) - however I did notice when comparing my new (plastic slide) Y frame to the original (LM12UU on smooth rod) that the original's movement is a lot freer away from the Y motor than towards it - I'd noticed that before but had put it down to the motor or belt - noby rayhicks - Ormerod
QuoteOrmerod187 I leave immediately ciao Dario oi! come back!by rayhicks - Ormerod
Hi again teddy - you're another seaman then ?(KimBrown does much of his thinking and printing on a tug) I know what you mean about the modding - I've been buying bits and bobs with a view to keeping the original Ormerod intact and building my own beside it, but the time felt ripe to try out at least one axis on the weekend (pretty much everything I THINK I need is here now, just a case of findinby rayhicks - Ormerod
Thanks Dario - you made the bearings out of bamboo? I thought it was just the structure - respect! Cheers Rayby rayhicks - Ormerod
There's a useful and informative article by whosawhatsis here that covers causes and prevention of Z axis ridges (of various kinds), I think it's a reprint from issue 1 of reprap magazine (https://s3-eu-west-1.amazonaws.com/reprapmagazine/RepRapMagazine_Issue_1_lowres.pdf) Rayby rayhicks - Ormerod
Interesting Radian - I wonder if it's "special" or just carbon fibre tape they've measured the resistance of and sell as heating tape? (there's a lot of plain carbon tape on ebay, but it tends to be fatter - there's other stuff on the general web on composite/fibreglass sites that's cheaper and may be worth a punt - I'll get some and try it!). Looks like the resistance is around 8-20 ohms per meby rayhicks - Ormerod
Quotebadman.teddy.edward Nicely done. I was contemplating the second Z support - could you be a gentleman and remind me what size the extrusion is (width not length)? Thanks teddy, I bought this stuff (bosch-rexroth 20x40, 6mm bore): which is identical to the RRP stuff - it costs £5.50 per metre and they cut to length I think two plates side by side is a good plan - you'd probably need a beefiby rayhicks - Ormerod
Quotekwikius Great idea. I assume its much cheaper than the ground rods and linear bearings? Perhaps you should add it to the RepStrap page. Cheers Andy - I cross posted on the aluminium extrusion forum, I'll take a look at the repstrap pages too - I think it probably is cheaper than smooth rod and bearings - I paid next to nothing for the steel (something like £10 for three eight foot lengths oby rayhicks - Ormerod
Hi Kim, thanks - it's not that much heavier actually - I've used two 500mm lengths of extrusion (instead of one 350mm length) - total weight of extrusion is 730g, and I used two 230mm lengths of 3mmx80mm steel for the ends - this weighs1.7kg/m so the steel weight is 780g, giving a total of 1.51kg - the original lower frame (extrusion, smooth bars bearings and plywood/mdf weighs 1.125kg, so I goby rayhicks - Ormerod
Le-seaw, in case you missed it, dc42 has now added gcode support for changing thermistor values in his branch of firmware Cheers Rayby rayhicks - Ormerod
Nice touches dc42, particular thanks for adding thermistor parameters. Briefly, what is the advantage of storing in flash by the way? Cheers Rayby rayhicks - Ormerod
I've had this problem too, if you dismantle the extruder and clean the hobbed nut it should start working again. The teeth chip off some abs and this fills the grooves and lubricates it and it slips against the filament( so the gears spin but no filament gets extruded). For me it only seems to happen if I print at high speed, Rayby rayhicks - Ormerod
Nice -thanks for the link Cameron, Rayby rayhicks - Extruded Aluminum Frames
Hi Appjaws, nor am I I use a mac, and on the mac version there's an "Open Profile..." option on the File menu - that should load the settings from the ini file (it certainly works on the mac). Note that I don't have temperatures set in my slicing preferences (on Cura or Slic3r) - since I like to use ABS and PLA on the same print, so I set those manually before I start a print run. My settingsby rayhicks - Ormerod
QuoteZeAllan One thing that I can't point out enough, is that vibrations from the movements spread into whatever the printer is standing on. The little blue rubber things you see under the feet of the printer are from an old usb drive enclosure, and compared to earlier attempts with felt pads they work wonders for the movement noises -- I'm tempted to say I hardly believed my own ears as I mounteby rayhicks - Ormerod
possibly Manufacturer's Part Number? Rayby rayhicks - Ormerod
Quotemancinism I wonder does Cura has the option similar to Extrusion Multiplier and calibrate the object dimension? Thanks Hi Mancinism, Cura has "Flow%" under the simple settings tab, in the filament section - use it like slic3r's extrusion multiplier, but use percentages rather than decimal fractions (eg 90% insead of 0.9) Rayby rayhicks - Ormerod
Appjaws - in the "machine settings" dialog, you need to untick "Machine center 0,0" which is Cura's default. You can try my ini file if you like (attached) Cheers Rayby rayhicks - Ormerod
drm13002 -I wonder if your first and second questions are related? It could be that your 3D model is floating (as well as not in the orientation you need), I use repetier host for mac which allows you rotate and position your stl's quite nicely before slicing. I presume you're using Pronterface/printrun with slic3r - if so it's possible to get the stl file to snap to zero using the "Plater' optiby rayhicks - Ormerod
Thanks for the pointer to FoldaRap Greg - looks like they're using printed rack as well as plastic slide bearings - I'm planning on testing out some acetal rack I've bought from Farnell pretty soon (seems to be cheaper than pulley/belt combo, but not as cheap as print it yourself!) Cheers Rayby rayhicks - Extruded Aluminum Frames
Oh - I just worked out what the second picture is - that's even smarter (maybe I should have read the legend "PTFE Taper How To"!) Rayby rayhicks - Ormerod
QuoteFlyskyhy QuoteWaterjet Tim Anybody know how to get Slic3r to output the right code for circles and arcs as my arcs look like a cog? Arcs and circles are evaluated by your CAD software, not by Slic3r; the .STL file does not contain arcs. All CAD software has settings for how to approximate arcs with straight line segments (or actually, for how to approximate bend surfaces with triangle surfaby rayhicks - Ormerod