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Hi All:
I built a Mendel 90 a few years ago, all self sourced. It is a great design, many thanks Nophead!
For these strips, I went out to the loading dock and found some plastic strapping used to bind loads to pallets. It is thicker and wider than the usual ones, and is a textured green colored plastic. It seemed to be heat fused to seal, rather than the usual crimp. It works wonderfully, and I
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j_andberg
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Mendel90
Hi:
I used 1/4" aluminum for my heated bed and somewhat regret it. I have to keep travel speeds fairly low (<30mm/sec) or the y axis (that moves the plate) will skip steps.
john
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j_andberg
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General Mendel Topics
Hi nic0laz:
I use 5/16 threaded rods and nuts. However the 5/16 SAE washers were too big. I had to order M8 washers from McMaster. I got the rods threaded rods and M8 drill rod (also very cheap) from Enco. It was by far the cheapest source. For the z axis drive I used stainless M8 rod, since only a little was needed, and the thread quality is so much better. Check out my BOM and build instructio
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j_andberg
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General Mendel Topics
Hi:
That was a very good idea. I looked in the 5d sketch and found the mega host_baud was different. So I changed it to the same as COM7, recomplied and uploaded. Now host, com port and sketch are the same. Still no change. The Mega RX light works when the reprap.bat runs, but not the TX light. The host GUI still does not open.
Yet there is no serial port trouble, as I can load and run the "hel
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j_andberg
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Firmware - mainstream and related support
Hi All:
I have made progress on this, but still have problems. I am using the USB driver set to COM7 and 19200 baud. I used the IDE v20 and the distribution ed2cd60. I uncommented the #define DEFAULTS MENDEL_MEGA_DEFAULTS line. The sketch then compiled and uploaded with no errors.
I then set the 5D preferences to COM7 and 19200 baud. I tried to run the reprap.bat file, and the GUI never appears
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j_andberg
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Firmware - mainstream and related support
Hi Matt:
The z axis turns only one way, and a fraction of a turn for each layer, at that. There is also no idler. I was having trouble with the x belt having excessive friction between the bearing and the stationary fender washers on the Sells. I also had misgivings about the 2 motors on one driver on the z. In an industrial setup, that would require another driver and slaved axis to implement p
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j_andberg
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General Mendel Topics
Hi Matt:
Many thanks for the kind comments. It makes the efforts worthwhile. Based on the suggestions from people that built it, I have beefed up the x motor mount to avoid any flex with keeping the x belt tension high. I will post a new zip file that includes the redesigned part in the next day or so.
I have generated a big assembly step file that I will also post, and a native SW 2007 file.
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j_andberg
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General Mendel Topics
Hi:
I second the weight issue. My Mendel uses a 6mm AL plate I had handy. It limits my feed/speed rate or the y axis misses steps. 30mm/sec is OK, but no more. I am planning on a lighter bed soon.
j
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j_andberg
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Reprappers
Hi:
I am using Adrian's Pololu electronics that is etched in the reprap (although I did a toner transfer). I am not getting that far to even try connecting that up, yet. The Arduino IDE works fine for v1.0 (with the "hello world"). I am using the Mega 2560 for the IDEs that support it > v20, and Mega for the rest <v20.
j
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j_andberg
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Firmware - mainstream and related support
Hi All:
I am having a very difficult time with the Arduino Mega 2560. My troubles are with the Pololu elecronics etched by a Mendel. I ordered a Arduino Mega 2560 board (since the original Mega was no longer available), and I built the electronics. Now my problems start. I can not get the 5D firmware to compile and/or load. More specifically:
Using the latest Mendel distribution, I can not comp
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j_andberg
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Firmware - mainstream and related support
Hi All:
I am a Reprap user that has been lurking around the boards for a few years. My name is John Andberg, and I live by UCSC. I built a Techzone kit, and then in frustration designed and built my own Mendel. It is listed under "Simplified Ball Bearing Mendel" in the wiki.
I am currently upgrading electronics from gen 3 to something more modern, and duplicating printers. A recent project I ha
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j_andberg
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RepRap Usergroup - Monterey Bay Area, California
Hi Greg:
My design is under Simplified Ball Bearing Mendel. Please print and enjoy...
john
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j_andberg
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Reprappers
Hi:
My design (Simplified Ball Bearing Mendel) uses a bit less than 1.5lb (about 0.65kg) at 25% infill density.
john
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j_andberg
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Reprappers
Hi:
I had endless problems with this in my Techzone mendel. I also had only one washer. Finally, I cut my 6mm belt to 5mm, used both washers (placed with the most rounded side inward) and kept the belt loose. This eliminated most of the problem. I suggest you switch to a design with a vertical x belt as soon as possible. Either Prusa or mine (Simplified Ball Bearing Mendel) have this, maybe othe
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j_andberg
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General Mendel Topics
Hi All:
Please check the BOM in my Mendel variant "Simplified Ball Bearing Mendel" for a cheap M8 oil hardening ground drill rod. I use this rod (from Enco 505-0240) in all my builds, it is straight, smooth and cheap at 4.59 for 3'. Check the machinists BBS for the perennial Enco free shipping offers....
j
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j_andberg
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General Mendel Topics
Hi All:
I cleaned up the part names in the stl files, and uploaded again. Also uploaded the individual step files in another zip file. If anyone has questions, just ask. Next, I need to clean up the documentation a bit, and post the assembly step file.
many thanks,
john
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j_andberg
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General Mendel Topics
Hi:
I ran it a lot without lube before final assembly. Then I forgot to add any later. It really seems to work very well without. I really should add some, but then it will attract dust and such... The brass nuts and high quality stainless rod make all the difference. Also, my design has a belt on z, so it is geared down, as in the Sells Mendel.
j
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j_andberg
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General Mendel Topics
Hi:
In my Mendel variant (Simplified Ball Bearing Mendel, please excuse shameless plug), I used stainless M8 rod from McMaster, and brass nuts from an auto supply. I found suitable springs at my hardware store. The springs were "Servalite 84XAU". They should also work on a Prusa. The result was butter-smooth motion without any lube. See my documentation for the preload setting I used, and for th
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j_andberg
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General Mendel Topics
Just my $0.02 worth.
Anyone searching for a DIY 3D printer should arrive at a totally open source non-commercial list of choices. All files should be on the wiki, as other links disappear all often. We also need a minimum documentation standard for it to be listed on the front page, as that is where most people will land. Any design there should be able to be built by the average person searchin
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j_andberg
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General
Hi All:
I would like to announce the birth of a new Mendel design, the Simplified Ball Bearing Mendel. I have been working on the design, build and documentation for the last 6 months. It feature set includes:
1. Low printed parts count (15 distinct parts).
2, Printable in ABS with heated bed (no tall parts, all thin and flat on the bed).
3. All ball bearings are held in 2 standard housings, a
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j_andberg
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General Mendel Topics
Hi All:
To answer the question for others, I will document the answer.
To add to a link on a page like "Mendel Improvements" you can not add it on that page. If you try to look at the source, there is almost nothing there.
Instead go to the page you want to link to, and add a link to "Mendel Improvements" there. Not obvious to me...
One further question. I can not find where anyone added a ma
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j_andberg
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Administration, Announcements, Policy
Hi All:
Many thanks. I got my files posted. Just search for "Simplified Ball Bearing Mendel" to find them.
A few more questions that I could not answer:
I would like the PDF files to open when clicked, instead of being directed to the file and then downloading. How is this done?
I am also unable to find how to create a link, i.e. I would like to put a link to my design in Mendel Developments
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j_andberg
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Administration, Announcements, Policy
Hi All:
I have been working on a new Mendel variant, and am finally done with the design and build instructions. Now I am ready to post it, but am totally confused by the Wiki instructions. I now have 11 sections of a build text (pdf's to start), 15 stl and 4 dxf files. The stls and dxfs will all get zipped into one file.
What I would liket to do is create a page under "Mendel improvements" tha
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j_andberg
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Administration, Announcements, Policy
Great idea, I wondered why it was not used.
Also check out the LM335, a temperature sensing IC, about $1. It has 10mv/C output and goes to 150C.
john
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j_andberg
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General
Hi:
I had a similar problem, twice. The first time from bad gcode. Examine the gcode to see if the correct temperature for the extruder is being produced by skeinforge . Also check the host firmware settings to see if the correct temperature is being set there, as that is what you probably use to warm everything up before calling the gcode generated by skeinforge. Too cool and the hobbed bolt st
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j_andberg
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Reprappers
Hi All:
I have run into this problem a few times, and thought I might draw on the collective wisdom for some advice. I am trying to print an object with a rectangular hole near the perimeter (for a captive nut). Please see attached picture of the problem area. In this case, my layer thickness is 0.4mm, width is 0.6mm (1.5*width), extra shell on sparse layer is 1 (SF 41). What is happening is if
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j_andberg
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Skeinforge
Hi:
I am seeking advice about a problem I am having when trying to print objects taller than about 1cm. The problem is that the corners tend to lift off the heated bed about half way through the print, getting worse as more layers are added. I have a heated bed at 110C, covered with Kapton tape. I extrude ABS at 255C, layer height is 0.4mm. The print sticks to the bed so well, I can hardly get i
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j_andberg
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General
Hi All:
Just thought I would pass along the way I devised to get a complicated first layer to print well. I was trying to print a solid with numerous cutouts and small holes, and the first layer was not too good. Since skeinforge breaks up the print into a bunch of different regions printed in a strange order (along with my less-than-rigid laser cut system) the first layer had a some regions whe
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j_andberg
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General Mendel Topics
Hi All:
If people want to go the route of a real temperature controller, they are available on ebay for <$30. You need a temperature controller, temperature probe (I use a thermocouple), zero crossing switch, and heater (I use a flexible silicone rubber heater glued to the plate, but properly sized resistors are OK). Check out the web site omega.com for instructions on how to wire it up and t
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j_andberg
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Reprappers
Hi All:
Back to 20mm/sec and is pretty good. Been rebuilding a flaky extruder drive bolt. Be aware that the latest instructions on the wiki about coarse bolt hob are the best. The M3 kept filling up with plastic, leading to a lack of feed. Most of last weekend were dealing with that. Printing much better now, but still do not think I can print over 20mm/sec (skeinforge, no firmware accel). Is t
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j_andberg
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General Mendel Topics
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