Hi,
I am preaparing to build a 3D printer for large industrial parts where the strenght of the part and ability to produce a block faster (not weeks but days or hours) more important than the surface finish. So I choose to design for 1mm nozzle diameter and 0.8mm layer thickness. I aim to print at a velocity of 300mm/s upto 600mm/s. So I should be able to construct a powerfull extruder (possibly not a bowden type but a direct one). Therefore the direct extruder should be capable of producing upto 500 mm3/s of plastifying capacity.
According to my calculations. I must use a Nema42 stepper which weighs approx 4kg. It has 870Ncm. Possible gear ratio will be 1:1 or 2:1
Build dimensions: width =500mm length= 1500mm height=400. I need to produce long but narrow parts. (parts like machine chasis)
1- I wish a fixed bed . But Delta type is not suitable because of unsymmetrical part dimensions.
2- Since I need heavy direct extrusion , I think I can not use belts. I want to use direct ball screws and linear bearings , so that I can go faster with the heavy load.
I am considering a corexy design but the moving build table is a problem. Because I want to be able to scale it in future . Ex: 1mx1mx2m
The main question that I feel hard to answer is: What if I use a fixed bed and use a moving gantry just like this one : [3dplatform.com]
I know that the best construction would be something like : [bigrep.com] . But I believe the bigrep topology moves the whole 3 axis x,y,z over a fixed bed. It is maybe the most robust one but maybe hard to build for larger volumes . In my case I think this design is not scalable (I believe I can not realize more than 1m). For my parts where I have a long length (1.2m) and relative narrow width 0.4m. the bigrep is not practical to build.
I believe the downside of 3dplatform is that I may need powerfull servos to move the gantry when the speed goes over 200mm/s. (I have several nema42 steppers in stock, SI I want to use them.). I think this topology (3dplatform) is the most basic one to build.
What do you think? Which way should I go?. If I suceed I may also need 5mm nozzle and 3mm layer with a longer x axis configuration in the future. I tend to 3dplatform with some modifications But please give your comments/recommendations.
Best wishes.
Note: Important detail for my parts. My parts have a square shape, most of them are long and does not have very small direction changes in short distances. therefore I may need a lower accelaration but higher speeds. this may help to compensate a little bigger heavier moving column.
I am preaparing to build a 3D printer for large industrial parts where the strenght of the part and ability to produce a block faster (not weeks but days or hours) more important than the surface finish. So I choose to design for 1mm nozzle diameter and 0.8mm layer thickness. I aim to print at a velocity of 300mm/s upto 600mm/s. So I should be able to construct a powerfull extruder (possibly not a bowden type but a direct one). Therefore the direct extruder should be capable of producing upto 500 mm3/s of plastifying capacity.
According to my calculations. I must use a Nema42 stepper which weighs approx 4kg. It has 870Ncm. Possible gear ratio will be 1:1 or 2:1
Build dimensions: width =500mm length= 1500mm height=400. I need to produce long but narrow parts. (parts like machine chasis)
1- I wish a fixed bed . But Delta type is not suitable because of unsymmetrical part dimensions.
2- Since I need heavy direct extrusion , I think I can not use belts. I want to use direct ball screws and linear bearings , so that I can go faster with the heavy load.
I am considering a corexy design but the moving build table is a problem. Because I want to be able to scale it in future . Ex: 1mx1mx2m
The main question that I feel hard to answer is: What if I use a fixed bed and use a moving gantry just like this one : [3dplatform.com]
I know that the best construction would be something like : [bigrep.com] . But I believe the bigrep topology moves the whole 3 axis x,y,z over a fixed bed. It is maybe the most robust one but maybe hard to build for larger volumes . In my case I think this design is not scalable (I believe I can not realize more than 1m). For my parts where I have a long length (1.2m) and relative narrow width 0.4m. the bigrep is not practical to build.
I believe the downside of 3dplatform is that I may need powerfull servos to move the gantry when the speed goes over 200mm/s. (I have several nema42 steppers in stock, SI I want to use them.). I think this topology (3dplatform) is the most basic one to build.
What do you think? Which way should I go?. If I suceed I may also need 5mm nozzle and 3mm layer with a longer x axis configuration in the future. I tend to 3dplatform with some modifications But please give your comments/recommendations.
Best wishes.
Note: Important detail for my parts. My parts have a square shape, most of them are long and does not have very small direction changes in short distances. therefore I may need a lower accelaration but higher speeds. this may help to compensate a little bigger heavier moving column.