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Re: Weer begonnen aan de MendelMax 1.5 December 30, 2013 05:47PM |
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Quote
Ohmarinus
So, I've worked on the machine a bit more, printed a new extruder, designed a coupling system for the Bowden-system. Now the extruder is mounted to the side of the MendelMax wth 2x M5 rods that are screwed in the centers of the top-extrusions on the right side. I tapped the centers of those beams with M5 taps and created a clamp that clamps onto the M5 rods and has holes where the Bowden coupler and the extruder mount onto.
The filament reel is standing right underneath the extruder, so the filament goes straight up from the roll into the extruder with minimal effort.
Lubed the bowden tube on the inside with corn oil.
Did 1 calibration test, the results can be found in the images and are stunningly correct. Before I checked the X, Y and Z I ran a little E-steps/mm correction round because I was not getting correct layer bonding and the prints would delaminate.
Printing temperature had to go up to 205º coming from 185º and layers bond well together now and make a nice and solid connection between each PLA layer.
Decided to ditch the effing borosilicate glass pane, it was a waste of money, it's not even flat completely and it was too much of a pain to get it leveled well. The aluminum plate I had laying around that I had CNC'ed out works a 100x better Oh, and for whoever says Kapton tape doesn't work just has cheap Kapton or something, it works magic, however with PLA you need to clean it more often.
However, a better Y-axis is something I still can improve on. Also the hotend is positioned too much toward the front of the machine, this causes the printbed to have to move too much to the front to reach the full printbed surface. It is not a 'real' scenario ofcourse to get full 200x200mm prints, but still, making the best out of it should be a priority during the next year.
Here are the pictures, I hope it's interesting to someone.
- Marinus
Print-cooling funnel in ABS with support material, first time working with support material
Mounted the funnel
Extruder and Bowden pneufit mount, there is a missing part in the picture, the mount that goes in between both
Here my cat almost gets his paw cut off by the machine while I smile for the camera...
The reason why I show this picture is because he is super-afraid to go near my Reprap Air 2 because it's so noisy. The A4988 stepper drivers in the MendelMax make it so nice and quiet that he doesn't even really notice the whole machine being so busy with printing! Crazy cat (by the way, he was trying to reach for a piece of curled-up extruder PLA that came out of the nozzle when I was testing the E-steps/mm)
Printing a test-piece for X, Y and Z. First try, immediately went well! The layers are also consistent, no Z-wobble whatsoever!
Should be 100mm... ohwell, nobody will notice this
And here should be 50, I think this can/should/will be improved (notice the glossy finish on the bottom of the print where you see the reflection of the caliper!)
All in all a very good experience and besides printing stupid calibration stuff, it's time to try out some model from thingiverse, however I really like to just design my own stuff for daily life, it's a good benchmark to occasionally print a nice model from thingiverse.
The only thing I'm still havig a bit of trouble with is, you guessed, retraction. This is because of the hysteresis in the bowden tube. Flexibility, stretch and compression of the filament en tube and kinetic energy of the entire moving piece of filament.
And when you see this, please comment on the machine and prints. I know the cables can be a lot tidier, and they will be, but first finish the machines printing quality and create a more stable filament-reel-roller
Re: Weer begonnen aan de MendelMax 1.5 January 01, 2014 10:42AM |
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Re: Weer begonnen aan de MendelMax 1.5 January 11, 2014 07:29PM |
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