Here my machine , it has a duet 3 running in stand alone , i had a rostock max v2 before but i always been unhappy with some of the feature or quality of the piece it would print , i started looking at other printer i wanted dual extrusion capability but couldn't find one that had a decent build size , so i started toying around the idea of designing my own , i Used autodesk inventor a lots for drawing parts in the past so i went to work.

I looked at a few design and when for a more cube design since they seemed more robust than many other design around , main frame is made of 2040 aluminum extrusion bolted together with corner plate with a few reinforcement in the middle of the section the back one as more since it support the vertical rail. it sit on top of 4 big compression spring that act as leg so vibration is not spread back in the frame

I wasnt ready for the challenge this build was going to bring me , my plan was to use the power supply i was using for my rostock a 850 watt 12 volt pc power supply , the heat bed it on the bigger side 300x400mm caused me many problem , i had to get a mosfet for the bed , still caused wire to melt , ended up having to buy a better mosfet and a dedicated 24volt power supply for the heatbed , it solve all my wire problem now they stay cool , the rest of the machine is still powered by the 12volt unit ,

The Y gantry went throw a few change throw the project. each change solved an issue , each axis was supposed to be powered by only one .9 degree stepper motor but due to the weight and inertia of the gantry i had to add another one for the X axis , this solved many vibration problem , then came the Y axis , my original idea wasnt great to tension the belt and then found that the cheap linear rail on the Y axis had play in it since i had it in a reverse position , (should have bought the real hiwin) , ended up changing a few thing gain some MM in the Y axis , fixed most vibration now ,

Printable area so far seem to be around 300x350x600mm .i am using a Flexion HT kit for the extruder. print head has 3 blower to cool the print , 1x40mm and 2 x50mm. All stepper motor are .9 degree. The lead screws is m8 x1 one lead only , it take a while to home and get up but give good resolution on the Z plus the 40mm stepper is sufficient even when power is off to keep the Z up

I still have a few tweak to do here and there but overall it is really close of what i had imagined , i did break my budget a little as well , eventually i will have the whole printer encloses in some Acrylic sheets or similar material, i have 4 set of LED band in the printer as well, all running from the sata connector on the modular power supply ,

There is still a few things i will likely change and upgrade to my liking just to fix the last few issue and then the rest will be to figure out the best CURA setting for the material i use.

Here a few picture from the start to the end , it doesnt show everything otherwise there would be too many picture

The way the bed is attached to the rail this is now one big piece

Well I believe I've done my best benchy to date with my printer. .15 layer height , petg 30-40mms ! Switching my hot end to 24v has helped a lots since I can finally utilise my cooling with out issue .

slowly been working on it , here a little update , ive been slowly ordering part, thinking and designing more things .

here a quick picture of the new belt tensionner it does look better ! it print better as well, it seem to have got rid of most of the vibration that i could feel before .

Well i think my quest for enough cooling has been finally completed , after many attempt , version and all , swapping the heater from 12volt 40watt to 24 volts 40watt , i can now fully utilize all fan at 100% power and the nozzle keep up with a .8mm nozzle . Doing a benchy now to see the difference versus last few print , then i think i will do a bridge test . i always had issue before with bridge because not enough cooling .

here a picture from the cad software of my head with the e3d chimera and bl touch

Here another update , i have ordered a duet 3 expansion board so i could mount a second motor facing the other one in the Pulley box for the Z , with the addition of this i will be able to get rid of the temporary counter weight . my Z will be powered by 2x60mm .09 stepper motor now. i as well redesigned a bit the carriage for a more better look and functionality .
Added as well pivot area now for the cooling fan in the front and back just need to remove a screw and they will pivot so that they wont be suspending in the air , less chance of breaking those tiny wire and faster access if i have to.

Since my printer is on the big side , i will be adding a few shelf on the right side so i can put the multiple box of material giving me extra weight on the machine so probably less vibration as well.

Well I reprinted my motor mount with a few tweak , new y axis in , just need more calibration. Kinda enclosed my top too now.
I still need to calibrated my config , him at 800 jerk 10k acceleration, my stepper motor are capped with those number I believe , but I have better one on order . before the swap i was running 6k acc

Firt benchy 35min , .6 nozzle .25 height. in PETG Him still missing some cooling fan but it still pretty good

here was the input shaper give me for data

Top is old , bottom new hgr15 vs mgn9 + carbon fiber tube about 1/2 to 2/3 lighter.

Swaped out many of my part on the Y axis for what i had redesigned , print are coming better it seem so far , added the last shelf as well , that give a lot more weight to the printer , the whiole machine doesnt move as much as it used to now , vibration should be lower as well. still figuring out how i will finish the enclosure as well got a few idea just cant make my mind lol !

@Snippy Be very careful with the cheap chinese SSR , quality is really random .

i use these here for my heat bed and hotend

https://www.auberins.com/index.php?main_page=product_info&cPath=2_30&products_id=674

Well here another update on my printer , replaced the 6mm belt for the Z axis for some 12mm , and changed the pulley as well to 20 teeth from 60 and had to readjust my e-step seem i gain around 3X the step now , when machine is off my bed doesnt go down anymore with the switch to smaller pulley there enough torque now . next step is to finish the top once i get more extrusion and reprinting my motor mount making them beefier. then it should be fun printing time !

@mrehorstdmd this , i personally just want a simple system , the way him set right now , even power off bed will not move at all

well i ve done some testing and him close to figure out the acceleration and jerk this things like , tried a 150x150 square with only 2 layer for wall , and was able to get the movement speed up to 1200mm/Sec without skipping but it was at the edge of the acceleration . but 900-1000mm/sec no issue

@fcwilt yea , my goal was to keep it simple with only one axis to power the bed , I always run a bed mesh before print so bed leveling doesn't need to be 100% perfect , him just testing things out .

Well adding up reinforcement on the z axis didn't seem to have fixed my issue , i think i would just have to double the linear rail and block on it , but i had some old mgn15 rail laying around and tested something , so i decided to put that rail at the front of the platform , it look at bit goody but so far it seem to have completely eliminated any wobbling of the print bed . platform goes up and down without any problem , so i think him gonna test this a bit more and see how to it goes . before i order any more rail for this

Got the accelerometer working tonight and I it seem zvddd at 40-42hz was the flatest curve like.
Tomorrow I can hopefully fix the print bed shaking and keep going on those calibration and push the speed to see how far it can go

Other option is to wire these directly to the psu . Personally I use similar led strip but I wired mine directly to the psu .

Did some further tuning , extruder is nearly fully dial , skew compensation should be bang on , z axis step seem fine , just need to reinforce the z axis and we should all be set for more printing test .

so a bit rough looking and lots of stringing from the old pla but not the worst benchy ive ever seen since it on an untuned machine , lots of stringing lol

So now I need to calibrate things a bit more but I ended up doing it quick I wanted to test print lol

So far it seem the single 2020 were the z axis rail is, is not stiff enough and make the bed shake a bit , so I will need to had Some reinforcement to stiffen that . Need to work on my klicky dock as well . test printed with some old PLA that i had laying around ,

current setting in config is :

; Axes
M584 X0.0:0.1:0.2 Y0.4:0.5:0.3 Z1.1:1.2 ; set axis mapping
M350 X16 Y16 Z16 I1 ; configure microstepping with interpolation
M906 X2400 Y2400 Z1200 ; set axis driver currents
M92 X80 Y80 Z2560 ; configure steps per mm
M208 X10:205 Y-40:200 Z0:300 ; set minimum and maximum axis limits
M566 X900 Y900 Z100 ; set maximum instantaneous speed changes (mm/min)
M203 X90000 Y90000 Z500 ; set maximum speeds (mm/min)
M201 X20000 Y20000 Z500 ; set accelerations (mm/s^2)

him curious to see how far i can push this machine once i fix the last few things

https://youtube.com/shorts/fzIPFbDoUN0?si=KXMfYhU3RpQwFzUO

@T3P3Tony need some cables tray lol