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  1. It looks like there are two parameters witch determine the volume: length and diameter. as far as i understand, Flyguy is talking about the length: with the force sensor you measure the force on the tube and from there you can calculate the length deviation of the bowden witch stands for a length deviation of the material volume. The measurement and calculation seems quit complex to me but really add value. A cheaper and easier way can be a feed forward in your extrustrusion (extruder acceleration: force on bowden: longer bowden: needs higher set point and visa versa) The bowden can be app
  2. Ook van belang is het model Ultimaker (lees: electronica) je hebt. Heb je toevallig een UM uit de 1e of 2e workshop ? Wat is het model van je electronica ? Berend
  3. All, In my opinion the hot-end 'bowden-peek-brass interface' not the most serviceable part of the UM. Inspired by your idea, I picked up an older project I did some months ago despite my hot-end was working fine. - I tapped thread in a teflon hose so it can be screwed (?) inside the Peek and there it meets the brass tube. - The other end of the threaded teflon I connected to the bowden tube with a printed interface (funnel on bowden side and thread on teflon side) - The bowden is pushed in the funnel by Owen's : http://www.thingiverse.com/thing:11864 (what a piece of art is this, perf
  4. Hi, i'm using a version 1.1 PCB in combination with an Arduino Mega 2560. At this moment it's running with Marlin firmware which was re-adjusted by Bernhard/Hendrik for a combination of 1.1 PCB with Arduino 1280. (2nd workshop config) Should i be able to use Marlin v1.0.0 B with my config ? Thanx, Berend
  5. I assume u mean 'Max Z acceleration' from the machine menu. If this is not correct i'm curious where to find the 'Z acceleration' adjustment. Paul, sry, next time it's 'Paul's profiles' Flo, your such a modest guy Greetz, Berend
  6. All, I examined the influence of the Netfabb option 'Toolpath->Override->Speed' on the generated feedrate for Z. Here my results: 1. The Z feedrate is affected by the Speed override. 2. The feedrate is override is calculated after Max. Z acceleration calculation. vf-low-poly-bow-tie.zip Next focus is on Z feedrate generated by SF. Have fun, Berend
  7. Troubleshooting on the height deviation of my objects (Z axis problem) it looked at the generated code, in particular the Z moves. The goal is to find out how a z move is defined in Netfabb gcode and what values are used The approach was generating Gcode files, extract the lines where Z motion is defined and examen these. The victim of my research was a cube of 1x1x1 mm. (no cubes were harmed in this research) Result: 1. Z moves are classified as 'fast jumps' by Netfabb (Toolpath -> Visualisation -> Display fast jumps) 2. Moves (G1) with a new Z setpoint have allways the same X,Y a
  8. Hi, Sprinter indeed is a firmware hack with several improvements and a different approach of positioning. In stead of moving steps step if creates a path with a acceleration-speed-deacceleration. See: http://wiki.ultimaker.com/Sprinter_firm ... _Ultimaker Sprinter has a derivative called Marlin. A it finds it key to succes in trying to keep speed constant by looking ahead in your printing sequence. See: http://wiki.ultimaker.com/Marlin_firmwa ... _Ultimaker For more close to source info and Flattr: http://bernhardkubicek.soup.io/ (Ian, be sure you had your valium before you visit
  9. Hi Toni, Thx for thinking, but... the place of the header/footer you describe is the same i described in the 1st post. The header you can define here is like an 'extra' header/footer. It's placed to the top (header) and bottom (footer), additional to a Netfabb generated header/footer. So the complete header/footer consists of a user defined part AND a Netfabb defined part. For me it's interesting to know how this Netfabb generated code can be manipulated. I like to have control over the full header and footer including the Netfabb part. Looking forward to your experience with this, Be
  10. Thanx Dave, My reaction and some new questions The starting Z position is fine and reliable, the total object height can deviate up to +15%. Personally, i don't know about Gcode Small but it is and was always ON and i've got the same issues with Netfabb. A rootcause can be found by overshoot from Z position: the energy thats needed to stop the platform from moving down cannot be delivered - Electronics: poor stepper driver adjustment. - Mechanical: speed too high - Software: Z feedrate too high - Firmware: PID not optimal (Do the PID settings cover the 2 different Z spindle
  11. All, Every now and than, i experience Z positioning problems. The height of my prints is not reliable, sometimes caused by positioning overshoot, sometimes by missing steps. For troubleshoot purposes i'd like to play with Z positioning/speed/acceleration. 1. Is there a way to play with these parameters in my gcode generators (SF/Netfabb) or must i do this in the firmware (Marlin)? 2. I've got a old type of Z-spindle, the ordinary 8mm thread. Does this need special attention in settings ? 3. How is Z motion defined ? is it 'just' making an amount of steps/distance or is there a control lo
  12. Netfabb generated gcode contains a 'fixed' header and footer witch u can expand with a user defined gcode header/footer (Machine/...Extended Setup/Ultimaker specific) The Netfabb header contains homing (G28), temperature setpoint (M109) and some more things. I'm looking for a way to manipulate or turn OFF these Netfabb header, so i can use my own sequence. Anyone ? Grtz, Berend
  13. Hi all, to keep things a bit clear i made an Ultimaker mindmap. Maybe it's a good tool for new Ultimaker operators. I cannot upload the file to this forum, the file extension is not accepted :( so I uploaded it to thingiverse: http://www.thingiverse.com/thing:13060 For view/edit the map i use Xmind ( http://www.xmind.net/ ) greetz, Berend
  14. Do you preheat manually before building the code? -> Yes. Greetz, Berend
  15. Hi, i'm no expert but as far as i know: 1) How do I know which start.gcode SF uses? On my system (Mac OS) in the ReplicatorG25 directory, each skeinforge engine has its own directory with /prefs in witch different (gcode generator) profiles are stored in separate directories. In each profile directory is a subdirectory called: alterations. In directory alterations, the start.gcode and end.gcode are stored. /ReplicatorG25/skein_engines/skeinforge-35/skeinforge_application/prefs/SF35-ULTIMAKER - Quality print/alterations/start.gcode For ReplicatorG24 it's different; its a file in a hidde
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