Hey you all,
I’d like to build up my own 3D-printer(the head shall also include a laser for cutting next to the extruder;-)). Also I like to develop most of the parts on my own to get a deeper understanding. After looking around I see so many cartesian systems but only a few of them are in the corexy setup. May you please explain me why? Apart from a “higher” complexity i can only see advantages of this setup, no motors need to be moved…
So what are the advantages and disadvantages of a CoreXY set up?
Thank you very much in advance!
Best regards,
Sebastian
The gantry in a core xy setup needs to be more rigid and precise or you will run into racking forces that seize up the movement or significant premature belt wear.
That makes sense. But an aluminum frame should be able to take up that moment shouldn’t it?
And my thought is going for aluprofiles so that:
1st: I will have a rigid “perpendicular” frame
2nd: I can easily adjust positions for motors and especially shafts by using nuts inside the profiles.
Am I going the wrong directions in my thoughts?
Thank you very much for your help!
I disagree with Stephen, he’s thinking of the inferior HBot gantry. CoreXY is inherently balanced and doesn’t have any issues with racking or wear.
It’s a really good gantry style and most modern high-performance printer designs use either CoreXY or an Ultimaker style cross gantry now. Both are “parallel Cartesian” approaches and are very good. Mostly the the other options you see like i3/Mendel printers are aiming for minimum cost and don’t care so much about performance.
@Ryan_Carlyle Could you please suggest any Core XY printer that have V slot aluminum profile, also I do not want printed parts (like C-bot or D-bot). I am searching, but unable to find. Thanks
@Selvakumaran_Ganesan people who avoid printed parts usually also avoid plastic wheels and use linear rails instead. Look at the DICE, Jetguy’s Big Boy, and Carl Raffle’s Clone R1 for some really good linear rail examples worth copying.
The only V-slot, minimum-printed examples that come to mind are the Fusion3 F306 and F400. Great printers.
Both h-bot and core xy kinematics require greater rigidity against both perpendicular and torsional forces or you will end up with racking problems. They also both require a greater degree of precision to avoid premature belt wear.
More basic cartesian setups can absorb a relatively large amount of error without causing damage and premature wear on components, the same isn’t true of core xy or h-bot configurations.
@Stephen_Baird CoreXY belt tension intrinsically prevents racking. You don’t need any rigidity where the X bridge meets the Y rails at all. Whereas HBots always want to rack, and you need extremely beefy bearings to keep the gantry square during acceleration.
The belt wear thing… Eh. I have two CoreXYs with extremely “abusive” belt routing (rubbing at the cross, coming off idlers crooked, violating backside-bend minimum radius) that have been running for years without any issues. Maybe a little “black snow” during initial break-in.
@Ryan_Carlyle Thanks for the suggestions… Let me check for any of the design. Carl Raffle’s Clone R1 is looking good. I hope you have supported a lot for this printer.
Are the design files available for any of these printers?
@Selvakumaran_Ganesan the Clone R1 is closed hardware (for now) and open electronics/software. Carl hasn’t decided yet to my knowledge whether to expand the beta run to full production. I included it as a gantry approach you must want to copy because it’s really well-engineered.
DICE is fully open source. Jetguy’s Big Boy is open but not terribly well documented, it’s mostly a series of build photos on Jetguy’s Flickr stream unfortunately.
@Ryan_Carlyle Thanks for the suggestions. Let me check any of these and go for one…
Thank you guys. Would you suggest at all to design a printer on your own?