Thanks Neil. I missed the modules before. Now I know. Thanks, Demetrisby demetris - Mendel90
I am looking for the x idler OpenSCAD file. I have looked in the nophead's github repository for Mendel90 but I couldn't find it. I want to print this part but this issue happens. Therefore, as suggested in the linked page, I want to make a small hole in order to make it slice. Has any of you tried to print this part? Thanksby demetris - Mendel90
There is an article about Z artifacts in the first issue of the RepRap magazine ( ) you will find useful. It is on page 29by demetris - General
This is great! Thanks for the video. So you have a glass in the front which slides upwards? I may follow your example and build one for my mendel90 as well.by demetris - Mendel90
@ben_van: I am also thinking to build an enclosure and I was wondering if it going to be noisy due to vibrations. How was your experience?by demetris - Mendel90
That is a really nice enclosure! I really like the door mechanism. Nicely done. How much was the cost? Also, does it enclose the back of the printer as well?by demetris - Mendel90
@nophead: Heated chamber becomes more and more attractive as fine tuning proceeds! Do you have any suggestions for Mendel90 chamber?by demetris - Printing
Can you attach your gcode somewhere?by demetris - Printing
Bed is just glass. But I try to understand why this happens.by demetris - Printing
What filament material do you use and what temperature are you printing with?by demetris - Printing
My PLA prints have a minor warping. I was wondering what is the reason that objects wrap. My initial thoughts were: Temperature difference between layers. Bottom layers are hot due to heated bed and upper layers cool down after a while, and this difference causes warping. Plastic tension. Corners tend to warp because of the tensions pulling it together However, I printed a part (attached) whichby demetris - Printing
Thanks for the information! QuotenopheadI have never known the PVC version of the Z coupling to slip though. Sorry I should have mentioned before that that is most probably my fault as some of the lubricant I applied on the threaded rods, must have moved down with time. The motor shaft was all greasy. I cleaned it now and tried a temporary fix until I get some tube.by demetris - Mendel90
After many tests and inconclusive results, I noticed that the indicators on the threaded rod were out of sync. Then I notices I could move the threaded rod (from the top) freely! Almost zero traction! It makes me wonder how I got my prints so far! I unscrewed the mounts and I saw this nophead, do you have any ebay link for buyng that material?by demetris - Mendel90
Quotenophead You can get the first layer off by more than the layer height. You are right, this seems to be the case! I have changed with Z_HOME_POS (Z_HEIGHT_MM in neildarlow's updated firmware), essentially raising the head by 0.41mm! This is very odd because I am definitely sure that the head was not crashing on the bed. Any ideas here? It seems we are on the right track. The new piece has aby demetris - Mendel90
Quotenophead Objects shrink less in Z because the higher layers tend to compensate for any shrinkage in the lower layers. How much it shrinks vertically will depend on how hot the object is when the last layers are added. That actually makes a lot of sense. I designed and printed a calibration piece in openscad. This is the result: Each 'leg' of the part has a different layer height, of equal iby demetris - Mendel90
So Chris, do you believe its possible for the lead screws to have the wrong pitch? Do you believe changing the firmware Z steps per mm is good practice? On another note, could this also attributed to ABS shrinking? Even though I imagine that shrinkage happens only in XY.by demetris - Mendel90
Not sure right now, I will have to do more tests. However, either the case, it would be good to know the reasons for wrong Z height so I can check them anyway.by demetris - Mendel90
What do you think is the reason for a part to come out shorter that it should? The error is about 0.4-0.5mm. One cause I can think of is the wrong Z_HOME configuration but that can't cause such big error on its own. Thanksby demetris - Mendel90
Thank you again for the answer, I understand what you are saying. I think I will proceed building an enclosure and see how it goes. I understand that we want the bed to be uniformly heated to 110C. But even if it is heated uniformly how does it prevent warping since the air directly above is what causes the part to cool down. What I mean is the the air will cause shrinking anyway, either you havby demetris - Mendel90
Hi Chris and thank you for the reply. I never had any problems with PLA, if I remember correctly. The warping problem only appeared when I started printing with ABS. So you wouldn't recommend a non-heated enclosure at all? Wouldn't it at least increase the air temperature to some degree and therefore it will reduce the force of warping? This could be enough to prevent you part from lifting fromby demetris - Mendel90
Hmm I was also thinking of building an enclosure but for sound reduction. Just for clarification, enclosure is good for ABS because it will keep the temperature difference between the bed and air smaller? And therefore the ABS wont bend at the edges?by demetris - Mendel90
Hi, thanks. I am currently printing the second ABS part just to make sure it wasn't luck the first time. It seems to be sticking so far... My glass was a bit dusty so I just removed the dust with a tissue. Nothing else. Also I bought the ABS from here. Unfortunately before I finish writing this post, the second experiment failed :/. Maybe its because I didn't clean the table at all this time.by demetris - Mendel90
I just printed my first ABS part today, after a year of PLA . I am sharing my details and lets hope you find them useful! After spending some time in the forums I read about a lot of problems for ABS (mainly bending?). I got really confused about whether to use tape, and what type of tape, or ABS juice, but it's toxic etc etc. At the end I decided to go ahead and print as I was printing with PLA,by demetris - Mendel90
@Neil: I see what you are saying. I am just thinking that the probe cannot be entirely fixed because after probing it has to move out of the way. Based on that, all that movement may cause some inaccuracies to the distance between the probe and the extruder which eventually will influence the Z_HEIGHT_MM value.by demetris - Mendel90
I believe nophead has a valid point (its been a while since I calibrated and everything still works) but on the other hand it would be exciting and I would love to test this feature . Quoteneildarlow With most additional features there is always the desire/necessity factor. As svanteg mentioned, the biggest advantage is not bed-levelling but Z-height compensation. When you say Z-height compensaby demetris - Mendel90
Hi Neil, Great work and a big thank you! I updated my firmware for the first time (I bought my Mendel90 March last year) by following the instructions you provided and it worked straight away. Now I should read about auto-leveling and implement it. Thanks again, Demetrisby demetris - Mendel90
Hi tjb1 and thanks for the openbuildspartstore.com link and information. Really interesting. Is there any standard build design I can follow? I don't think I have enough experience to design my own machine. Thanks, Demetrisby demetris - General
Hello everyone, A friend asked me to help out building a laser cutter machine. I was thinking to buy a reprap (with or without the extruder, no problem) and attaching a laser diode on the head. The machine should have build area of 600x400mm. Unfortunately I couldn't find any kits with this area (or larger), and I was wondering if any of you could suggest something. Thank you! Demetrisby demetris - General
Oh I see! IT WORKS!!! Thanks guys! Seriously thanks a lot! Demetris NewPerfection Wrote: ------------------------------------------------------- > demetris Wrote: > -------------------------------------------------- > ----- > > Tried the two nuts but again they unscrew after > > the second or third movement... > > Tighten the nuts against eachother.by demetris - General
Tried the two nuts but again they unscrew after the second or third movement...by demetris - General