No, alu with glass on top. Measured the movement at 0.5 degree delta, it was about 0.01 mm which makes no difference at 0.2mm layer height but at 0.1mm due to the increased proportional difference. Printed the original part without artefacts. The band at the top is slicer related.by hsbontop - Printing
Made a three loop cylinder and printed with previous settings (bottom), with hotbed turned off (middle) and with PID (top). Clearly bang bang hotbed creates some artefacts even if the delta is low. Printed a single wall cube with PID as well, it came out with no artefacts and spot on in width. I'll have another go at the precious part. (Reason for not using PID was burned electronics causedby hsbontop - Printing
Any ideas what the origin of the z artefacts in the enclosed picture could be? It appears at 0.1mm layer height and does not correspond to z screw pitch (M8 1.25mm whereas this is about 0.8mm). I am using a self sourced Mendel90 and the print is done with fan on, PLA @200 PID and bed @70 bang bang delta 0.5degree. The model was sliced with slic3r and the preview looks ok. The layers look slightlby hsbontop - Printing
Not sure what you are referring to, I would like for the arduino upload to store the settings permanently. Anyhow, problem solved... had forgot to disable eeprom support in the Marlin firmware.by hsbontop - Mendel90
After a month or so of inactivity I started my printer and had to adjust the height and the E-steps due to switch of filament. The upload proceeded as normal (without errors) but when running M503 no values had changed?!? Tried a bunch of times with various usb ports and approaches, no error messages during upload but nothing changes. The same applies for any other parameter I tried. When changinby hsbontop - Mendel90
Thanks for the heads up. I have seen this particular model in series, it did however not say of there was a ground issue. PWM Hz, not sure, standardish Marlin for Mendel90 though.by hsbontop - Controllers
The PSU worked for a three hour print, bang bang not pwm as before. The no load problem crossed my mind hence I will add a 24v 10w bulb as load to see if it makes a difference. Got hold of two free 575w server PSU that can be connected in series to produce 24v if the old one does not improve. The voltage or pwm probably killed the power expander although it is rated to 48v (probably not during pwby hsbontop - Controllers
After a month of successful printing, with a new 24v PSU dedicated to the bed, first the power expander burnt then the PSU doubled in voltage. Without a expander i connected the PSU to the melzi ground and let the built in MOSFET do the job. The increase in voltage seem to happen when the system is in idle i.e. no print loaded and goes away after a few on/offs. The problem still occur when disconby hsbontop - Controllers
What would be a suitable size of the gate resistor when using a IPP100N04 (TO-220 N-ch 40V 100A 0.0025ohm) to power a 1.7ohm heatbed with a 24v 15a PSU controlled by my melzi?by hsbontop - Controllers
Added a picture of the phenomena at overlap 0.07 And a comparison of (bottom up) 0.07, 0.1, 0.15 and 0.25. Increased overlap does improve the quality but Cura does not produce any holes at all and further increase will probably introduce other artefacts.by hsbontop - Skeinforge
During calibration I have noticed the top infill has small holes when filling a cube at 45 degrees but only in the section where the path length is increasing, when passing the middle and the path of getting shorter the holes disappear. This made me wonder if the infill path length is calculated at the short side of each path hence under extruding when hitting an angle >90 degrees and over exby hsbontop - Skeinforge
Turned back to skeinforge to print a few spares and realised there must be some setting seriously wrong causing over extrusion at the top layer. When extruding 100 mm PLA at 185c exactly 100 mm goes in, single wall is at this point more or less spot on (0.5 mm in skeinforge and 0.55mm in real life which should be about right as no support is provided from adjacent paths). Enclosed is a comparisonby hsbontop - Mendel90
Did you figure out what caused the 10% discrepancy?by hsbontop - Mendel90
With a alu heatbed I had no problems getting the sides next to perfect as long as the rods pointed in the "right" direction (visually confirmed after assembly). But you are correct, the spring does seem to affect the result slightly. I guess next step would be to remove the spring and use gravity only.by hsbontop - Mendel90
Spent a few evenings with a dial gauge but were only able to get the edges level not the sides. Figured my mk3 heatbed was warped so I tried bending it and use shims without any improvement. A few days later I realised the problem must lie somewhere else and tried rotating the smooth rods, voilà the rods were bent by a 10th of a millimetre in the middle. The dial gauge showed an variation of 0.05by hsbontop - Mendel90
The wades block filament guide diameter and position has been changed from nophead's standard mendel90. The block is based on my machine configuration ie not dibond but I don't know if my parameters has affected other parameters of the block. I can post the modified scad so you are free to produce your own STL or maybe nophead can give some input on compatibility. Anyway it depends on the machineby hsbontop - Mendel90
Using these with great results. http://www.thingiverse.com/thing:884248 http://www.thingiverse.com/thing:491316by hsbontop - Mendel90
Stl's posted here http://www.thingiverse.com/thing:884248by hsbontop - Mendel90
Quotenophead If you are using the standard Mendel90 extruder it only works with 3mm filament. I changed the scad to work with 1.75 mm filament. Quotenophead It might work or it might not close far enough, depending on the hobbed bolt. However you don't want a geared extruder for 1.75mm filament as you want to drive it 3 times faster with 1/3 of the force. Having it geared will limit your retractby hsbontop - Mendel90
Configured nophead's scad to work with 1.75mm and switched to a 1:1.2 gearing for additional speed. Currently using e3dv6 with great results. Scad/stl can be posted on thingiverse.by hsbontop - Mendel90
Had to start a new account on my computer as slic3r does not like Swedish letters (åäö) and the administrator account contains one of these which makes saving of settings impossible. That made me wonder if this could be the reason here as well and embarrassingly enough I had renamed the cure converted files without the ä whereas the original file contained that letter. Now everything works fine,by hsbontop - Slic3r
Link attached, stl printed just fine (pitch on the thread a bit too narrow though). Original stlby hsbontop - Slic3r
Stl attached, printing the cura converted file as we speak. The original file was too large to attach.by hsbontop - Slic3r
A threaded part I created wont open in Slic3r but opens fine in Kisslicer and Cura. Skeinforge fails as well. Meshlab and netfabb say there are no errors and when exporting the STL from Cura that file opens and slices just fine in Slic3r. The Cura stl file is about 1/6 of the original file size so there seem to be something removed that Slic3r has a problem with. Any workarounds to avoid Cura? Tby hsbontop - Slic3r
Increased retraction and the strings, that was more like fibers, disappeared. Printed a hole lot of calibration cubes to get the flow correct and realised the Slic3r multiplier was way low... The reason for this was the micrometer used measured single wall + layer offset, when measuring only three layers the width was correct when the top infill looked nice. The result is next to perfect prints.by hsbontop - Mendel90
Been running with 23:27 gears for a while now, only slight improvement of the blobs however. It seems like long travel distances worsen the issue and as I have had slight formation of thin strings maybe temperature is to blame. Attached is a 30 mm/s print with good result.by hsbontop - Mendel90
Quotenophead The retraction distance should be just enough to stop ooze on long travels. You can have the retract speed too fast though, so it doesn't have time to flow from the nozzle at the start. My comment was mostly to acknowledge the speed mod actually made a difference, lowering the distance solved the problem but my blobs still appear. I have kept the high retraction speed as per recommenby hsbontop - Mendel90
Quotenophead Is it overshoot, or is it too much plastic at the corner due to the axis slowing down and the filament flow rate lagging behind? The second is my main theory as slowing down and deaccelerating does not solve the problem, I am a novice at gitfu but should this not be something that can be changed in the fw?by hsbontop - Mendel90
I have tried changing speed,acceleration and jerk but still the overshot persists. There seem to be no play in the system, might this be due to the low gearing on the extruder when using 1.75mm filament? Figured this might be worth a try so I have configured a set of 1.17 ratio gears to match the 3=>1.75mm change. Also the nophead stepper update forced lower retraction distance as single wallby hsbontop - Mendel90
Looked at the last print again and realised the problem now is not blobs but dimples on this single wall print. Another look at the original flow single wall print and this also had dimples not blobs. The infill prints has blobs so a new go with the infill print with the dimple setting is the next step.by hsbontop - Mendel90