New Printer Design - Could do with some feedback / thoughts on spec! September 16, 2018 10:09AM |
Registered: 5 years ago Posts: 61 |
Re: New Printer Design - Could do with some feedback / thoughts on spec! September 16, 2018 03:51PM |
Registered: 9 years ago Posts: 465 |
Re: New Printer Design - Could do with some feedback / thoughts on spec! September 17, 2018 01:47AM |
Registered: 7 years ago Posts: 507 |
Re: New Printer Design - Could do with some feedback / thoughts on spec! September 17, 2018 07:10AM |
Registered: 11 years ago Posts: 5,780 |
Re: New Printer Design - Could do with some feedback / thoughts on spec! September 17, 2018 03:41PM |
Registered: 5 years ago Posts: 61 |
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CoreXY is fine, but moving the whole thing? No thanks. Moving the bed in the Z axis would be so much better. Lifting the CoreXY 8n the Z axis defeats the whole purpose of not having the motors moving.
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For the Z rails, (Well moving rails on any axis, really) careful alignment is needed, to reduce wear and noise, but a careful fixed alignment is usually good enough. Some compliance in the bearing or rollers can make up for small imperfections and avoid transmitting any artifacts to the print.
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I'm not saying a delta can't produce good prints, a "sloppy" delta can probably produce prints that are good enough for me, but I don't know what your standards are like.
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You don't need/want 4 linear guides for the Z axis. One near each screw is all you need. Linear guides provide guidance, they don't keep the bed from tilting. Using 4 of them is going to be an alignment nightmare. Even if you manage to get them aligned, when room/machine temperature changes, the guides will move apart when warmed and closer together when cool and the whole thing may come to a grinding halt. Quality linear guides are great bearings but very intolerant of misalignment.
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If you get the stuff with square ends and matched lengths you can bolt it directly together and skip the corner plates.
Re: New Printer Design - Could do with some feedback / thoughts on spec! September 17, 2018 04:30PM |
Registered: 11 years ago Posts: 5,780 |
Re: New Printer Design - Could do with some feedback / thoughts on spec! September 17, 2018 04:31PM |
Registered: 5 years ago Posts: 71 |
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Ed3D
My fear exactly - would two central rails (like in the images) work ok? Im concerned about the bed tilting either way! Is thermal expansion a major concern though? I will be printing mostly PLA and not in an enclosure!
Re: New Printer Design - Could do with some feedback / thoughts on spec! September 18, 2018 04:31PM |
Registered: 5 years ago Posts: 61 |
Re: New Printer Design - Could do with some feedback / thoughts on spec! September 19, 2018 07:11PM |
Registered: 6 years ago Posts: 90 |
Re: New Printer Design - Could do with some feedback / thoughts on spec! September 20, 2018 06:07AM |
Registered: 6 years ago Posts: 1,007 |
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gtj
If you use 3 Z leadscrews/motors instead of 2 (1 in the center back and 1 in each front corner) and you use a probe on the hotend, you can take advantage of auto bed levelling.
Re: New Printer Design - Could do with some feedback / thoughts on spec! September 20, 2018 03:38PM |
Registered: 5 years ago Posts: 61 |
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If you use 3 Z leadscrews/motors instead of 2 (1 in the center back and 1 in each front corner) and you use a probe on the hotend, you can take advantage of auto bed levelling.
gtj
If you use 3 Z leadscrews/motors instead of 2 (1 in the center back and 1 in each front corner) and you use a probe on the hotend, you can take advantage of auto bed levelling.