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Re: Building a No Name big printer - 10 years ago
More progress: 90% done with the CNC parts.by bonmotwang - CoreXY Machines
Re: Building a No Name big printer - 10 years ago
Some updates with pictures.by bonmotwang - CoreXY Machines
Re: Large-scale 3d printer - 10 years ago
My machine was designed to print ABS. But I decided to learn how thermal stress is going to affect my machine first. So mechanically, only minimal moving parts will be in the chamber if walls would be added.by bonmotwang - General
Re: Large-scale 3d printer - 10 years ago
If I decided to enclose the chamber, motors are outside. But first step is just PLA.by bonmotwang - General
Re: Large-scale 3d printer - 10 years ago
Great recommendation Val. You are right, and I should get it kicked off. and see what we get. A lot of work has been poured into design the whole assembly. Changing direction at this time is no fun. Thanks Val. Again, nice chat :-)by bonmotwang - General
Re: Large-scale 3d printer - 10 years ago
Hi Val I like your machine. very solid, which is my way into this. I just kicked off CNC machining last night. There are 26 different kind of alum. parts. But I have been debating with myself at late stage of corexy design of my machine: Do I really need corexy or just use normally way. My frame is about 1000mmx880mm and 900mm height. Total weight of the machine may hit 50Kg. I put my work ordby bonmotwang - General
Re: Large-scale 3d printer - 10 years ago
Hi Val If you find a online deflection calculator, you will understand what Dave is talking about. The thickness and the self weight are racing each other. You will be surprised about the thickness required in your design to achieve the flatness. Multiple point adjustable support is the right direction and I am designing that in my printer too. my glass is 880mmx580mm. I am planning to have 6 pby bonmotwang - General
Re: Large-scale 3d printer - 10 years ago
Quoteval c. Quotebonmotwang Hi Val The thread is in my signature. Understood that if the only heat source is the heated bed, there is no too much of problem. I have no concern about that in my design either. I am just thinking ahead if I make an enclosure to get the internal chamber to 60C. Then the problem may show up in some ways. Hi bonmotwang, I am still learning the ropes with regards toby bonmotwang - General
Re: Large-scale 3d printer - 10 years ago
Hi Val The thread is in my signature. Understood that if the only heat source is the heated bed, there is no too much of problem. I have no concern about that in my design either. I am just thinking ahead if I make an enclosure to get the internal chamber to 60C. Then the problem may show up in some ways.by bonmotwang - General
Re: Large-scale 3d printer - 10 years ago
Glad we are talking about big printer here, because I am building one too. I brought up the topic of thermal expansion in my other thread, but nobody commented anything. LoL. At 1 meter length, the expansion is about 1mm from 20C to 60C. Do you think this will cause any issues in your design?by bonmotwang - General
Thermal expansion difference between aluminum and steel could be a problem - 10 years ago
This has always been a question mark in my mind. So I did a calculation. A 500mm aluminum beam changes 0.5mm from 20C to 60C. A 500mm steel beam changes 0.2mm from 20C to 60C. 0.3mm difference is a problem because steel linear guide rail will be mounted on the aluminum extrusion. It will be a little disappointing if this printer cannot print ABS in a heated enclosure. Doing more research on theby bonmotwang - CoreXY Machines
Choose number teeth for 2GT pulley - 10 years ago
I read from somewhere 2GT pulley needs minimum 6 teeth engaged with the belt to avoid skipping. But it must under certain speed and certain force/torque. I couldn't find a guidance chart for selecting pulleys. I picked 20 teeth 10mm belt width for my corexy design. Understand that increase pulley size will decrease the torque which could be resolved by bigger motor, also the resolution, whichby bonmotwang - General
Re: Cast Tooling Plate Print Bed Flatness - 10 years ago
Thanks Mark for the information. I will do a thermal simulation with the frame and other details when the design is done. But I was planning to make the bed "floating" or "sliding", similar idea as the sliding mechanism on some bridge design.by bonmotwang - Mechanics
Re: Cast Tooling Plate Print Bed Flatness - 10 years ago
Not sure how heat is going to affect the alum extrusion frame and other structural parts. I am planning to have a heated chamber After the whole thing is modeled in Solidworks, I need to some thermal simulation to see the displacement. My heated bed is planned to be 400mmx600mm. length maybe longer (700mm) if I planned the Z axis well.by bonmotwang - Mechanics
Re: Cast Tooling Plate Print Bed Flatness - 10 years ago
Good information! Did you check the difference between cold and hot?by bonmotwang - Mechanics
Re: More than auto leveling ... - 10 years ago
Quotemunchit1 if your careful with a flat blade, you can plean a lot of smaller irregularities out, by carefully shaving off the top layer of uht glue, the next coating is then more even....but if your beds bent, its bent. Put a small spindle to end mill the whole surface probably a good idea too :-)by bonmotwang - General
Re: Building a No Name big printer - 10 years ago
Bowden design takes much less footprint than the direct drive. I want to make sure it has enough room to be able to mount a direct drive in the future. My plan is to use both. At least I can try both. Because this is my first 3D printer design. It probably will become a test platform for future revisions. I like Flex3Drive system. It is also in my test list. Thanks for all the links. Patrick.by bonmotwang - CoreXY Machines
Re: More than auto leveling ... - 10 years ago
QuoteDjDemonD Let me know if you manage to adapt it to work on cartesian/core xy machines. I've been thinking harder about this; this firmware has to print on a potentially uneven surface as Deltas suffer from effectively printing convex or concave because of their inherent geometry, so the autolevelling has to form a map of bed height points, a plane would be less use than a chocolate teacup. Iby bonmotwang - General
Re: Building a No Name big printer - 10 years ago
Yes, the mounting plate could be changed or removed for a lighter design. And I am planning to do my version of MK8 too. So that the extruder plate could be designed to be bolted onto the mounting block directly without a clamp. The U shape is designed as a universal mounting plate for now. At the final stage of the design tweaking, I will review the mass properties and reduce or remove redundanby bonmotwang - CoreXY Machines
Re: Building a No Name big printer - 10 years ago
This is my fancy belt holder.by bonmotwang - CoreXY Machines
Re: Building a No Name big printer - 10 years ago
Hey Patrick I noticed that your belt facing is not same as mine: In mine design it is opposite where the arrows are pointing at. I guess you twisted the belt at where they cross? Thanksby bonmotwang - CoreXY Machines
Re: MK8 heatsinking, is this a better solution? - 10 years ago
QuoteMechaBits Possibly cheaper to use the premade heatsinks as the cost is lower, nothing like having extra though, I bought one of these small 42mm heatsinks, even though it only had 2 holes not 4, thought I wanted it for cooling the stepper but there's no way to attach it to the back without unscrewing long screws holding things together, I decided not to bother, I've heard about steppers gettby bonmotwang - General
Re: Building a No Name big printer - 10 years ago
Quotepatrickrio I am using 400 step 78 oz inch 1.8 amp nema 17 motors, and I am only using .8 amps at 24v... I am almost certain that these would have enough power for your setup too... especially if you turned them up in amps. Then you can use standard control boards and drivers... I highly recommend the Duet board as it has a wonderful ethernet interface that I operate with my telephone. I bouby bonmotwang - CoreXY Machines
Re: Building a No Name big printer - 10 years ago
Great! Thanks Patrick, One more thing not to be worried :-Dby bonmotwang - CoreXY Machines
Re: Building a No Name big printer - 10 years ago
The stepper motors will have independent drivers. Control board just output control signals. Not sure it is an overkill. But if it turned out to be overkill, we can always change them to something else.by bonmotwang - CoreXY Machines
Re: More than auto leveling ... - 10 years ago
QuoteDjDemonD Might it be worth looking at the autolevelling feature in Rich Cattells Marlin firmware (https://github.com/RichCattell/Marlin). It does not just compute a new surface plane but follows an uneven surface whilst printing. I know this as I have seen it occasionally mis-read a particular point on the bed during G29 and then seen the print head deflect wildly above this point as it pasby bonmotwang - General
Re: Corexy vs cartesian for HQ, slow printing - 10 years ago
Hi J I am designing a CoreXY machine right now. The belt I am going to use is 10mm GT2. The foot print of the XY plan is about 1000mmx600mm. Do you think 10mm is enough? Thanks Paulby bonmotwang - CoreXY Machines
MK8 heatsinking, is this a better solution? - 10 years ago
While modeling MK8 into Solidworks, I figured out a better way and more efficiently to remove the heat. I integrated the heatsink into the base plate. This is the normal MK8 With the normal MK8 design the air flow is limited to one side of the heatsink, except the 8mm hole in the middle of the heatsink. The heat from the nozzle moves into the heatsink with some air gaps, then gets removed by thby bonmotwang - General
Re: Building a No Name big printer - 10 years ago
I designed a simple slider for adjusting the belt tension. Here it is The adjustment is about 20mm. I am using 10mm belt, so 20mm should be enough. This is my very first 3D printer design. Feel free to comment. Thanksby bonmotwang - CoreXY Machines
Re: Building a No Name big printer - 10 years ago
This is the preliminary design for mounting one MK8 direct extruder. Normal view: Bottom view: Back view:by bonmotwang - CoreXY Machines