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So i have been printing an R2D2 in abs in smaller section but i would like to be able to print large sections so would need 500 x 500 x 300.
Im ok at designing a new machine with all the associated components BUT even with an active heated chamber im still not sure if printing objects of this size without wasting days on failed prints is worthwhile.
Anybody done such large prints successfully
by
adambrum
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General
now ive converted it from oz.in to cnm the specs wrong on the website i was looking at , 60oz.in is about 42cnm which is way to much for a 23mm stepper.
From what your saying it should be ok.
Thanks Adam
by
adambrum
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Stepper Motors, Servo Motors, DC Motors
Just compleatinga build on plain carsitan xy printer, no corexy or hbot just plain old cartisan.
X axis has total length of 350mm with a light carrige running on a 20mm extrusion with 9mm mgn rail and bowden, i do have some 48mm steppers but was hopping to reduce weight a little.
I was hoping to get away with a 23mm (60oz.in) do you guys reakon this would be ok.
Thanks Adam
by
adambrum
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Stepper Motors, Servo Motors, DC Motors
Ive just got some of those cheap linear rails, first thing i did was clean and grease them which made a huge difference.
I used wd40 to clean them first then some 1200 grit wet n dry very lightly on the rails, cleaned again and greased with lithium based grease using a grease gun with a point on the end.
There is one thing missing from these rails and thats the caps that go in the bolt holes on
by
adambrum
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Mechanics
ive built a HEVO 300x300x300 and while its a good printer there a little to much flex on x-axis at 300mm.
I could start beefing up the smooth rods but thats adding weight which was the point of building a corexy.
A couple of things i would suggest is a solid heatbed, i have a 8mm cast alloy plate and a 750w 240v heater and ive only levelled once, i brought a bltouch which is a bit of a waste w
by
adambrum
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CoreXY Machines
The only way i think of doing it is by using sketch up with a Spirograph plugin and sketchucam to generate the gcode for GRBL but this is only good for x y coordinates.
Bcnc also has a Spirograph generator built in.
Perhaps you can convert the xy coordinates to delta style with the same maths as marlin uses to convert.
edit,
Thinking about it GRBL is only XYZ, might be easier to hack marlin a
by
adambrum
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Reprappers
I would keep away from fireline especially on a small printer, the line tends to walk on the drive pulley which alter the length
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adambrum
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CoreXY Machines
have a look at the "dice" printer for some good ideas on getting small corexy
dice
by
adambrum
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CoreXY Machines
Your homing position is set by the home switches, sound like they need moving
by
adambrum
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General
It should look something like this
// Travel limits after homing (units are in mm)
#define X_MIN_POS 0
#define Y_MIN_POS 0
#define Z_MIN_POS 0
#define X_MAX_POS 215
#define Y_MAX_POS 215
#define Z_MAX_POS 200
You also need to check bed size in your slicer
by
adambrum
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General
Good to know, i can make the x-axis from single piece of aluminium
by
adambrum
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CoreXY Machines
Had some spare time today to play on the router,
This is the start of the x axis carriage, first printed then cut in mdf as im still new to routing and then on to aluminium
by
adambrum
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CoreXY Machines
I am going to get temp swings, still at the designing stage so adding an extra bearing block is no problem especially if it saves problems later.
This does pose a few questions,
If i have a steel rail on aluminium then the aluminium expands approx 0.2mm more than the rail,
If i have a steel rail on carbon fibre then the steel expands more than the carbon fibre, cant find any actual data
So th
by
adambrum
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CoreXY Machines
Ive been looking at thermal expansion quite a bit and come to the conclusion that apart from the heat bed im better to ignore it.
I have a steel linear rails, aluminium frame , rubber belts and carbon fibre. I did think about going all steel for the frame but without a large milling machine it would probably be twisted.
by
adambrum
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CoreXY Machines
Good to know, Im at a carbon fibre research centre in a few weeks, might see if i can get some free off cuts
by
adambrum
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CoreXY Machines
Most important thing first, It has a name and its THOR,
Bad pronunciation and mix of words, 300mm build area corexy = three and core = THOR
Now to a technical question, Im planning on having a 15mm carbon fibre square tube across x axis, i do have a piece and its remarkably stiff but im now thinking about the heat.
Carbon fibre is fine just not sure about the resin, from a bit of reading it
by
adambrum
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CoreXY Machines
Does anyone have a flex 3 drive that could take some measurements for me.
I need to design a x-axis around it but im still waiting for mine, I have the width from a holder on thingivers but ive not seen the back of one yet.
Thanks Adam
by
adambrum
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General
Check the glass thickness too, your measuring the bottom and printing on the top, or rotate the glass to see if it changes
by
adambrum
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CoreXY Machines
Little bit of an update but no photos yet (sorry)
got some Chinese linear rails not expecting much but after cleaning them and greasing with THK AFF grease there ok. 12mm for Y and 9mm for X
decided to go with gates 6mm 3gt belts (these are 2mm pitch just thicker) couldn't find these as open ended so got long belts, should be here soon.
Duet wifi arrived
Still waiting on the flex3drive, nearl
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adambrum
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CoreXY Machines
You could loosen the bolts holding the ballnut and let it let it float a little, you'll get some backlash and you will have to adjust z home, remove any z hop but it may show if its out of alignment
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adambrum
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CoreXY Machines
Do you have the top of the leadscrew supported, could be worth removing it, the speeds we move at its not going to whip
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adambrum
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CoreXY Machines
Couple more thoughts,
Have you got a geared extruder with printed gears , might not be round
Have you got a flat tip for your clock ?, You could put the clock on the leadscrew move z up and down and see if it runs true
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adambrum
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CoreXY Machines
Im just starting to design my own CoreXY printer build , This will be my forth build (i3 , Rostock, cherry pi, hypercube evolution) but this will be my own design.
Also need a name for it.
The brief plan is,
300,300,300 build size
Linear rails for X,Y,Z
Carbon fibre x-axis
Belted for z axis
4040 aluminium for the frame
Completely enclosed except electronics, removable for printing PLA, thinki
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adambrum
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CoreXY Machines
Looking a lot better,
I would go to 0.4mm nozzle and around 0.2mm layer depending on picth of ballscrew and gearing.
Do a thin wall calibration too.
I swapped over to slic3r prusa edition due to poor finish on the outside
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adambrum
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CoreXY Machines
Just a couple of thoughts,
I read something a while back about bang-band control on the heatbed causing some strange issues or it could be thermal expansion knocking something out, maybe print without heatbed
Have you tried printing in vase mode might show a differance, could also try a different slicer
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adambrum
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CoreXY Machines
I've been using an airtripper for years and never giver me any problems, been on four different printers now.
https://airtripper.com/1764/airtrippers-direct-drive-bowden-extruder-v3-bsp-edition/]
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adambrum
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CoreXY Machines
Found the problem,
Swapped the steel reinforced belts for normal belts and hay presto back to normal just a little tuning for skew and im off running again.
Not sure what happened to the belts, i suspect that they stretched in just one area.
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adambrum
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CoreXY Machines
Im having some headaches trying to get to the bottom of weird dimensional problems.
My machine is a hypercube evolution and was running ok a while back so i know belt paths etc are all ok, frame is solid.
Running marlin firmware, slicing with cura and slic3r
Dimmensions from picture
x bottom 101.15
x top 100.00
y left 100.47
y right 101.13
diagonals are even at 142.55
I h
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adambrum
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CoreXY Machines
hi,
I have been looking around for ideas for a new delta build with about 300mm area.
I have a cherry pi now and before that a rostock. I did like the smooth rods of the rostock but the trax rod ends wore badly, I do like the ball joints of the cherry pi IIIs.
There are few areas that I could do with some advise.
Which is the best for movement, hiwin rails or openbuild.
Which are the best
by
adambrum
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Delta Machines
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