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 !

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

@jay_s_uk , that kinda funny in some way i have an orbiter 2 with a mosquito hotend and that things will not print any kind of flexible filament without any problem , even ASA sometime give me problem it seem orbiter 2 has too much space in the gear area ..

him in the process of building another printer and this time i when with the extrudort wit the goliath hotend ...

i Went with the LDO , super power HT for my build , they have nice spec for a quick machine and 180C temp max and since they will sit outside the heated chamber we should have a good margin. pick up the 55mm shaft version as well so i could add an extra bearing to support the end .

250mm print bed it is , it will use a silicon heater from keenovo with a voron cutout. Need to reprint gantry , did some change to make it smaller lighter .

main frame of the beast is mostly done , i need to add a bar or 2 in one spot and that will be it for that .

frame 1/2 assembled .

Z axis assembled, i have more aluminum extrusion on the way so i should be able to fully assemble the frames . still have many part to prints , to test

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@mrehorstdmd kinda but I want to keep cost down as well . From my early calcul this will be an expansive build about 3000 to 5000 $ at least . Depending of material to enclose the full printer.

@mrehorstdmd yea i understand that , but still after looking at that price , most of my component are readily available on amazon , other than the 2 side plates that need to be water jet cut for the final version it cost a fraction of that worm gear setup .

@mrehorstdmd said in My Second build (in progress):

@Dad003 One of these will make your life much easier. The 30:1 reduction enables it to lift very heavy beds, and it doesn't move when the motor is disabled, allowing restart of prints in the event of a power failure. It doesn't require brakes, additional wiring, or additional configuration. Just treat the motor like a normal stepper. I used 60 tooth pulleys on the shaft to get 20 um per full step from the motor. I've been using it for my 695 mm Z-axis about 7 years without any problems. The gear quality is very high, so there are no gear induced artifacts in the z-axis of prints.

Do you have a link to this particular one ?

My pulley system doesn't drop the bed either , I've tested it and you need over 10 pound on the table to even make it move