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RepRapPro's Ormerod http://reprap.org/wiki/Ormerod
Re: Powering Pi for Octoprint - 4 years ago
The 10R resistor is needed to get the 12V rail to be close to 12V. Without it the PSU throttles back to keep the 5V from being too high and then the 12V rails drops when the bed is on. I would keep it in circuit. I use the 5V standby rail to power my RPIs and then use GPIO to control the main PSU. Seeby nophead - Mendel90
Re: cura settings - 4 years ago
I have printed E3D edge, which is form of PETG but it only needs 240C. I printed all the kit parts with ABS at 255C for the first layer and 250C for the rest, so J-Heads can definitely can handle that for thousands of prints, even in a chamber at 45C. I know their spec says less but with the more accurate thermistor that I use I have not found it to be a problem.by nophead - Mendel90
Re: cura settings - 4 years ago
Ethyl acetate is a better solvent for PLA. I use that to clean the glass when printing PLA. One thing I have been meaning to try is to dissolve PLA in it an try 'PLA juice' as a bed adhesive like ABS juice made with acetone. So far I have not needed it as a hot bed for the first layer works well for me. I print ABS with a the J-head up to 255C. You can fit a E3DV6 to the standard Wade's block usby nophead - Mendel90
Re: cura settings - 4 years ago
Yes PLA should stick to plain glass as long as it is free from grease. I run the bed at 100C for the first layer and 70C on subsequent layers. Extruder 220C for Prusament, which is what I am printing at the moment. Never used hairspray or an form of adhesive. Just plain glass for PLA.by nophead - Mendel90
Re: cura settings - 4 years ago
Seems like the Z calibration is too low. Print an outline and adjust so it is exactly the first layer height as per the Mendel90 manual. When it is a lot too low you get a thin first layer rather that zero thickness because the pressure of the plastic is enough to lift the nozzle but it then doesn't lift enough for the second layer.by nophead - Mendel90
Re: No terminal window in Skeinforge - 4 years ago
On Windows or Linux I don't expect to get a new terminal window if I run a command from the terminal. The output should just go to the terminal it is started from. Not sure what happens if I run it from the GUI. Some programs do open a new terminal then. I am not at home to try it. I can't think why you would get garbage. Perhaps it is a character set problem.by nophead - Mendel90
Re: No terminal window in Skeinforge - 4 years ago
Not sure what you mean. I run it from a terminal window and it brings up a GUI and prints some commentary to the terminal I ran it from.by nophead - Mendel90
Re: MDF Parts wanted - 4 years ago
They are intended to be printed parts. They are not the same spacing as the off the self variety which I found to be very inaccurate.by nophead - Mendel90
Re: Problem with Layers - 4 years ago
It should carry on where it left off, so the worst would be a blob. Seems more like some lines of G code go missing. Have you been able to reproduce the effect at will? Possibly a faster PI might help but I still use RPI Bs to run my machines. I haven't updated Octoprint for a long time though as it does seem to get slower with each new release like most software. I try to stick with versions tby nophead - Mendel90
Re: MDF Parts wanted - 4 years ago
The MDF version of the machine is designed to be made by hand from rectangular sheets. In the UK I can buy MDF cut to size in B&Q. It is done on a saw that ensures perfect rectangles. You can then print the PDF drill templates and tape them over the top, prick though the crosses to mark the holes and then centre punch them. You do need a coping saw to cut out the gantry after drilling the hby nophead - Mendel90
Re: Problem with Layers - 4 years ago
Don't forget to anchor it at the spool end. I.e. like the original dust filter.by nophead - Mendel90
Re: Problem with Layers - 4 years ago
I don't know, my Mendel90s still work fine with the original lead screws. I would start by installing the PTFE tube that stops the filament dragging on the print head. If the filament is hard to pull it can lift the carriage. Even if it doesn't it pulls towards the centre at the edges of the print and increases backlash, that is why it is in the design.by nophead - Mendel90
Re: Problem with Layers - 4 years ago
Is the Z axis sitting down on both nuts? If for some reason the Z bars are leaning such that when you level the bed only one nut is bearing the weight, then the Z motion could be erratic.by nophead - Mendel90
Re: Problem with Layers - 4 years ago
It's hard to say without watching it go wrong or a better description. It seems to get offset in both X and Y simultaneously and also seems to get smaller and taper back out to the correct size. I can't think of anything that would do that but perhaps I am interpreting the pictures incorrectly. Is the carriage firmly attached to the rails? Sometimes the carriage can break at the back where the tby nophead - Mendel90
Re: Problem with Layers - 4 years ago
Have you got a picture of what the part is supposed to look like. It looks like the top is shifted in both X and Y? Are you sure the filament isn't dragging on the print head? Do you have it feeding through the PTFE tube. If not it can lift the print head and cause layers to not attach properly and also cause X shifts. Can't explain a Y shift as well though.by nophead - Mendel90
Re: Mendel90 openscad and pythong - generating views - 4 years ago
No there isn't anyway to query what is on screen in OpenSCAD. You will need to figure it out from the BOM files.by nophead - Mendel90
Re: Mendel90 openscad and pythong - generating views - 4 years ago
Yes the extra / will definitely break it. It won't include the configuration so nearly everything is undefined.by nophead - Mendel90
Re: Mendel90 openscad and pythong - generating views - 4 years ago
Running views sturdy_E3D should get the configuration from scad/conf/sturdy_E3D_config.scad and build correct views into sturdy_E3D/views.by nophead - Mendel90
Re: Mendel90 setup - 4 years ago
This is why it homes upwards: No I don't know why it doesn't stop either if M119 reports H when the bed is fully forwards.by nophead - Mendel90
Re: Mendel90 setup - 4 years ago
Sometimes, due to a build up of hole clearances it is possible the carriage hits the left bar clamp before the switch activates. In that case loosen the two font bar clamps, one at a time and slide the left one forwards and the right one backwards. Odd you would need to do this if the machine had been previously working though.by nophead - Mendel90
Re: Mendel90 setup - 4 years ago
The Y axis switch is attached to the front right Y bar clamp. You would need to push the bed towards the back to see it. So if the X switch is working does homing move towards it and stop when it hits it? Note that the switches only stop the axis motion during homing. After that it knows the position and limits movement in firmware, so should not be able to hit the switch again.by nophead - Mendel90
Re: Mendel90 setup - 4 years ago
They should change to H if they are pressed while M119 is typed. The switch should open and the input pulled high. >I didn't make any changes to the firmware, loaded it straight up from the USB. Not sure what you mean by that. It should have had firmware already installed and be ready to use. Did you load new firmware via USB using the Arduino IDE? If so where did you get it from?by nophead - Mendel90
Re: Mendel90 setup - 4 years ago
You can test the limit switches by pressing them manually and typing M119. They are connected normally closed, so if a connection breaks they trigger, so it is hard to see why it would try to go past the endstop unless it somehow misses the switch. I am assuming you haven't changed the firmware? It's very odd that it would work on Windows but not on a Mac as these sorts of issues are due to wiriby nophead - Mendel90
Re: Mendel90 setup - 4 years ago
Looks like all the switches are closed, i.e. not triggered. If it thinks Z is 0 it won't allow it to go any lower. What values do you get when you home the axes? X and Y should be -100 and Z about 202 when the limit switches are triggered.by nophead - Mendel90
Re: Mendel90 setup - 4 years ago
What position does M114 return? What does M119 show?by nophead - Mendel90
Re: Mendel90 setup - 4 years ago
Yes I probably should have done that. I didn't realise it was backwards until many had been sold. The only difference it makes when the origin is the centre is the bed contents are rotated with respect to the slicer / host view.by nophead - Mendel90
Re: Mendel90 setup - 4 years ago
Mendel 90 is sort of backwards. I.e. those directions are correct when viewed from the back of the machine. Since the origin is in the middle of the bed it doesn't make much difference. If it starts in mid air then the Z axis is not calibrated. At Z = 0 the nozzle should just touch the bed (when it is hot). See the manual here for calibration instructions applicable to the firmware it shippedby nophead - Mendel90
Re: Printing in bottom left of bed only - 5 years ago
I prefer PET tape to Kapton tape for ABS.by nophead - Mendel90
Re: Printing in bottom left of bed only - 5 years ago
The firmware I supplied for Mendel90 has the origin in the centre of the bed, so you need to set up the slicer to place the object at 0,0 instead of the corner. In Skeinforge that is on the multiply tab.by nophead - Mendel90