UPDATE: Ok I have updated to the latest version of marlin, enabled firmware retract and am using volumetric extrusion now, next will be filament diameter sensors. I LOVE This version of marlin its much improved. FWRETRACT should be enabled by default IMO, the ablilty to adjust retract distance and speed on the fly as needed for differennt areas of a print is amazing.by djinn5150 - Smart_Rap
Actually I am using 5/16' drill rod which is very close to m8 rod, its a hardened steel, not as hard as it should be but its a decent trade off on price vs performance. If you polish them well and go with bushings even aluminum rods could be used.by djinn5150 - Smart_Rap
Quoteeviltoy A question on the heavy duty carriage. Wouldn't the nut work its way out eventually like on the prusa i3? Maybe add a hole for a m3 screw to fix the nut in place permanently It's possible but I did make the hole a pretty tight fit to, at least on my print, gravity should hold the carriage to the bolt, and I have had 0 issues with it yet, many hours of printing. If it does become aby djinn5150 - Smart_Rap
yeah that will do it, get them installed and tested yet?by djinn5150 - Smart_Rap
Marlin There you go, do not try to heat anything with this, you will have to modify configuration file to match motherboards, i have fwretract enabled so keep that in mind if you want to move forward with it, you will also need to change the number of extruders and disable the heated bed if you don't have one otherwise you will error out with min temps Better change steps on the Z axis too I amby djinn5150 - Smart_Rap
Can u run an m501 and post the results?by djinn5150 - Smart_Rap
Quotewillera Okay I will try and change the voltage down see if that works, the motors were getting pretty hot without me doing much. As for the firmware and the ramps board, could you send me a copy of your firmware and a photo of your wired board for me to have a look at? Well I can upload my firmware to my smartcore fork in the morning, but a picture of my ramps wiring is going to be lessby djinn5150 - Smart_Rap
It can indeed work just fine, you just set your offset in the y axis, actually in the firmware there is y/x offsets for each hotend. although if they have any height difference on the nozzles it becomes a real PITA, you also need an extra (offset*2) or you loose that space when printing from both nozzles...ie, they both need to reach front and back, I might be off on the *2 but its what I figureby djinn5150 - Smart_Rap
This was my solution for the fan, just model up a plate to mount to the backside of the head with a groove in it to accept a 3mm screw, the plate helps to equalize the tension on the front and back from the belts and gives you a nice place to mount a fan or anything else your hear desiresby djinn5150 - Smart_Rap
If they just hum a few things come to mind...1 current 2 accelleration/jerk or 3 both On my DRV8825's I had to drop things down to .25v on vref to get good results, I am using 1/16th stepping on the axis and 1/8 on the extruders, motors pulling in opposing forces would just cause it to move in another direction, they need to do this by design so most likely your current settings or accel is theby djinn5150 - Smart_Rap
Not bad at all my friend, looking very cleanby djinn5150 - Smart_Rap
Ok For me I had to have the X Motor on the Left Y on the right. You did make sure COREXY is enabled right? If you manually push the head to the center and move +x 5mm what happens? Are your steps correct for your pulley's? I have 20t pulley's with 1/16th step motors and I need to be at 80 steps if your z is using same pulley it should be 80 all around 16t pulleys should be set at 100 Forby djinn5150 - Smart_Rap
I did all PLA, sliced with Cura with a 1.2mm shell (3 perimeters on a .4 nozzle) at 45 to 50% infill, everything has been solid, Welcome to the Core crewby djinn5150 - Smart_Rap
Well finally got around to doing a few changes I've been wanting to do not in any paticular order 1. Added a cooling fan to the carriage, just tossed a spare hotend bracket i had from my many trial and error with the dual adjustable mounts on the back of the "head" and bolted up a hinged mount. 2. Installed the Chimera, man this thing is nice, I am having some oozing issues I have to figure ouby djinn5150 - Smart_Rap
Quotewillera Did you guys use the standard firmware for Marlin on ? what did you have to change in the congif files? EDIT: just realised that its actually this... FWIW, I am using the marlin I started with my smartrap, but standard marlin will work, so will repetier firmware. Just enable coreXY kinematics and set your normal stuff like bed size motor steps etc. Right now I am running at maxby djinn5150 - Smart_Rap
Quotercjoseb Thanks for the compliments. Each z axis will have its own motor and GT2 belt. The single belt/motor/threaded rod sounds like a good idea as well. Now you have me thinking too! Another way it can be done is to use a dual shaft Nema 17 motor. Attach a 5mm threaded rod or 5mm drill rod to each side of the shaft with a coupler and the ends of the rods to a pulley/belt. Closed GT2by djinn5150 - Smart_Rap
Mike, where did you source your belt? I am guessing here but from what i can find on ebay the closed loops are measured by teeth count? McMaster doesnt have gt2 from what i can tell but I will try to mock something up later today, mine is so wide its gonna take one long belt, thinking skate bearings for "idlers", Might have to go with printed pulley's on the 8mm rods if we can't find 8mm shaftby djinn5150 - Smart_Rap
Looking mighty fine, mighty fine indeed. Curious how your experience with the belt driven z goes, just makes me super nervous. Are you planing on driving it with 2 motors? I had thoughts of running a 5mm rod from one side to the other with some bearing blocks supporting it to the bottom of the bed, pulley's on both sides, and one in the middle driven by a single motor. Similar thoughts on drivby djinn5150 - Smart_Rap
FWIW M555 will return the current setting, M555 Z2.5 will set the Z offest to 2.5mm it will return Z-probe offset now 2.5 Don't forget M500 to store the settings. Hopefully that will fix the problem if not get back to usby djinn5150 - Smart_Rap
Well got my chimera finally, I got to say so far I am pretty impressed, though it's going to take a bit to get things calibrated, getting retraction right on these long bowden tubes is just kicking my behind. I think I am going to need to up my temp and lower my retraction to avoid back pressure on the bowden, I think i have been retracting to far and running into pla swelling causing jams. Alsby djinn5150 - Smart_Rap
Yes that could definetly work for what I was thinking...although It eats up a lot of space, not sure if it would work in a real application as an "add-on" but a box built with that consideration in mind would be perfect. I might just still do what I was talking with a single motor in the back center with 2 wide z rails on each side, Just concerned with the twisting, maybe a belt system running 2by djinn5150 - Smart_Rap
Sorry to hear you are having such a rough time with this build, as for square, YES the belt has everything to do with square between x/y belts must be equally tensioned. For the Z it seems I may not have been having issues with my print on my belt version after all. When I originally started to print parts the belt Z was my first print and I too had some tension issues, like maybe the carriageby djinn5150 - Smart_Rap
As a precaution, Z and Extruder are only availabe under the 1mm move to avoid potential problemsby djinn5150 - Smart_Rap
So from SD I think the only way to do it is edit the gcode file with a M117 periodically to display the ETA, but I think i saw a modified version of marlin that had a progress bar somewhere sometime, but never really looked much into it. Rep Host will pop in a m117 in the background with updated eta as it prints but not from SD. If i can find a link I will post it upby djinn5150 - Smart_Rap
Should be under Info Screen > Prepare > Move Axis > 1 mm > Move Zby djinn5150 - Smart_Rap
Quotercjoseb I found this modified extruder for the SmartRapCore in Thingiverse listed under SmartRap. I don't know if it works but looks like it will, especially with the added nut holes. Not sure about that one but I have printed this one and am enjoying it very much so..., but I am a Wades fan check out this as well...you might suprise yourself, this time last year I couldn't model anyby djinn5150 - Smart_Rap
Oh yeah Mike, it does cam to, might work good for the engraverby djinn5150 - Smart_Rap
Well got notification that my Chimera has shipped so while I wait i decided to play around in Fusion some more, I am really really liking this for free software. The toolchain is a bit diferent then what I am used to but I am getting there. Imported the stl for the mount bracket I have installed now and and a model for the chimera and came up with this..by djinn5150 - Smart_Rap
Basically where you were having challenges with the clamps, I was having challenges to get the lm8uu to fit properlly, so I just printed some undersized bushing to fit the holes, or you can sand theese out a bit to make the lma8uu fit properly.by djinn5150 - Smart_Rap