foehnsturm
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Everything posted by foehnsturm
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You started this thread! So I guess that means you can hijack it! What controller is that? TinyG? Beaglebone? Smoothieware.org has everything you need to know about it. -
Time will tell. There are still some minor issues, a loose washer and a kind of resonance with certain moves. This was just a stress test with crazy 1000 mm/s max speed and 9000 mm/s2 acceleration settings.
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What tip for the Merlin are you using there? Also, I have found that the Merlin tip is very sensitive to crossflow fan airflow during the first millimeter of the print. Have you noticed this and if so, what work around have you used. The tip is my own design. A workshop made me a batch with 0.2, 0.4, 0.6 and 0.8 mm (which can be drilled to 1.0 mm). If you like to try they are 4 € / piece. I didn't notice the sensitiveness so far. But it makes some sense as the heated mass of the nozzle is so low. However, I always tried to extend the heating block isolation thing some mm downwards to reduce the airflow hitting the nozzle.
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Hey guys. Thank you all for your great work! So this new forum thing has at least one interesting hacking thread alive ... (Don't want to offend anyone ;-)
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For a park and resume test I'd insert the gcode every layer change. There should be some comments in the generated gcode which indicate a new layer. And yes, I figured out the commands using the ulticontroller.
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I'm playing with the same idea, basically the H setup like in the Builder. I'm just still in doubt if I want to go for two motors/heads mounted on it (like the BCN sigma) or to stick with the magnetic mounts... I think I'll start playing with both ideas in CAD first. Even one week after finishing the strike German Post is not up-to-date with its delivery and so I'm still waiting for belts and pulleys. Otherwise I'd soon be able to report on a first test of the x/y gantry. I went for linear rails basically because I'm lazy (simply bolts on to laser cut metal parts) and many printer manufacturers use them as well.
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I think that's true for the standard designs with heavy printheads. I want to go for a payload less than 200 gr and the rail is only 370 mm. However I may be wrong. In that case I would support the single rail with a laser cut strut which also incorporates the mounting plates to the moving blocks on both ends.
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@anders-olsson. If you come up the same ideas they cannot be that bad. Come on let's do it together ;-) The design is somewhat inspired by a youtube from a guy I'm sure you already heard of, Martin Bondéus. But I intend to use stacked laser cut steel sheets instead of a single one with bended edges and place the belts directly underneath the rails. Also thought of a delta but the effector design would require a completely different approach for automated tool changing. The XY gantry is partly assembled now but as German Post has been on strike for 3 weeks now I still have no pulleys and belts.
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Merlin Hotend on an Ultimaker
foehnsturm replied to foehnsturm's topic in Third party products & modifications
Correct, as far as i can remember the modular printhead groove profile for the Merlin was some 0.5 mm off. I remember that I heated the aluminum part a little and pressed it into the fitting. -
Sounds weird I know, but when I slightly touch the wiring at that time I often get the crashed Ulticontroller screen with funny symbols as well. So on my UMO it's definitely something electrical.
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Occasionally, I see the same with my UMO. My best guess so far: wire cross talking. I just wiggle the flat ribbon cables and reinsert the connectors and the issue usually disappears .
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A smoothieboard 5x has enough thermistor inputs and MOSFETs for 3 extruders and a heated bed. There are 5 stepper drivers but also a bunch of unused pins broken out. So, one or two external stepper drivers should be feasible.
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@ultiarjan Thanks! Some parts are already ordered but t'll take considerable time until something will be assembled. I went for Misumi Miniature Linear Guides and a corexy gantry.
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Well, I already made some decisions: 1,75 mm filament, linear rails, direct extruders, ... I'll start with 2 or 3 tool heads. With 1.75 mm filament and without bowden tubes I'm quite confident to find a way to avoid tangling. While other parts are close to a final design, the "wires" and "tubes" are only for illustration.
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I'm still there watching ;-) Didn't made so many posts recently cause I've been thinking about how to get the most out of this idea.
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UM original with direct extruder
foehnsturm replied to foehnsturm's topic in Third party products & modifications
True, without cooling the stepper can reach 60-70°C, just some degrees to high for regular PLA. For long prints I attach a small fan to the printhead for cooling the stepper. When printed with high temp resistant PLA, XT or the alike everything seems to be ok. -
Congratulations! From the very beginning I had the feeling that this idea has a lot of potential. Some z-space at the parking positions to implement a wiping mechanism would really come in handy now.
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What was the bed temperature with PET? Might have a bigger influence on distortion than the hotend temperature.
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Just turning the M10 PEEK a little within the aluminum mounting part (Merlin hotend). But as the nozzle tip is a little off center the x/y offset may change slightly due to that.
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Well, I actually had an email conversation with Sander. If I understood correctly UM is watching this and sees it as an alternative if some other project they are currently focusing on fails. Don't know more. I'll follow this idea anyway. Looks to good to be abandoned. However my approach for a printer designed around a tool changer would/will be a corexy with smoothieboard and linear rails.
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I did that and it works quite well. However it's surprising to me how much extrusion is needed for certain filaments to stabilize. E.g. I almost failed with dual extrusion and Filaflex which requires a crazy amount of priming after idle times of more than a few seconds.
