Jonathan (pcbng_jh), I started with the project but am having difficulty finding any compatible chips on cut tape... (required per the PCB NG guidelines). I'll keep looking otherwise I think we may have to find another IC.. (maybe ATiny85?) but always difficult to find cut-tape and not whole rolls (2000+ units). Jonby jonnycowboy - General
Awesome work! those prints look nigh-on perfect (or perfect with respect to any normal stepper issues). I'm still working on the BOM to get components that PCB NG can source and print, will keep you all posted.by jonnycowboy - General
I'm going to try getting these done on PCB.NG ... let me know via PM or here what the part numbers are and I'd be happy to finance the first roundby jonnycowboy - General
PCB Assembly in the states is getting cheaper.. If the design is done could we try getting it done here:by jonnycowboy - General
I think he is just asking that the PWM wire that is use to drive the brushed motor controller be "broken out" so that an external motor controller can be used. Perhaps a jumper could be used to select onboard/external if required to properly drive the onboard (PWM) vs. external (servo signal) controllers.by jonnycowboy - General
I can get the parts cut at Seeedstudio once the idea is built up with 3D printed prototypes for the NEMA14 / lower gear ratio solution.by jonnycowboy - General
Powermetal, are your files available? I'd like to rework it for the NEMA14 two-bolt stepper (50g only - 14HR08-0654S). With your solution we could bring the complete cold/hot end down to 100g combined with the new DeltaMini hot end.by jonnycowboy - General
You seem to be pretty experienced, do you have any data for any setup/resin? I heard the Epson piezo print heads have orifices that may be too small, preheating the resins may allow us to use them - thoughts?by jonnycowboy - Polymer Working Group
Hi all, is there a chart around for 365-405nm LED power cure times for various resins? I'd like to know how fast I can print drop-by-drop. (ie: milliseconds?) thanksby jonnycowboy - Polymer Working Group
Yes but with the printhead provided by the now common Epson printers (Epson WorkForce ET-4550 maybe). I think that could feasible, do you have any experience with the polyjet?by jonnycowboy - General
Instead of a UV laser we can use low-cost 5W UV LEDs at <2$ each:by jonnycowboy - General
So, the information on here: is pretty out of date. I was reading a new paper today: which is based on MIT work with (what I guess is) a modified Stratasys printer. It uses a 4-head design with: solid resin: bucktown polymers ZVE200-V420: flexible resin: spot-e: support resin: bucktown polymers Rinse Out Resin (ROR): hydraulic fluid: water or simple mineral oil The new Epson ECOtank prinby jonnycowboy - General
Actually it could support itself especially if you mount the end-effector to the end of the "X" axis and move the axis entirely along the vertical, that way the counter-balance is limited.by jonnycowboy - General
Quoterestinpieces Is this a 3mm or a 1.75mm hotend? I couldn't find this information anywhere. It is a 1.75mm hotend (information taken from here)by jonnycowboy - General
Quoteto3dornottobe About splitting the encoder from the motor; You can't compensate structural misses (play, backlash) with PID tuning. You need an intelligence that's capable of determining the difference between the input and the output. and store these differences to make it 'as close as possible' (stil, not ideal).. But this would require both an encoded motor and an encoded reader to determiby jonnycowboy - General
QuoteJamesK QuoteHave you thought about adapting the single fan hot-end/print cooler duct That design makes no sense to me - you need independent control of the hotend and print cooling. Some of the derivatives include manual or motor control valves, but the general design is the same.by jonnycowboy - General
Quoteshai We can't guarantee it will be compatible with any sort of mounting system because we didn't work around any sort of mounting system. We designed our own. That doesn't mean that you can't print out your own custom designed mount Groove mounts are old fashion and they don't work well. 24V will be in the works after we ship the 12V first. Sign up on our homepage at the bottom to be notiby jonnycowboy - General
QuoteJamesK QuoteWhat this solution "solves" is the magical 100g flying hot end which will never be acheivable with a stepper based solution. Unless the stepper is at the other end of a bowden. I've never used a bowden arrangement, but it seems lots of people do - what is it about bowden that we are trying to avoid/improve on? Sorry I was unclear - this is a direct drive hot end / extruder andby jonnycowboy - General
QuoteKoko76 Quotejonnycowboy QuoteKoko76 Good luck Paul, I believe that you will find "closing the loop" to be more difficult than you think. Modern machine tools still keep servo encoders on the motor shaft instead of the moving table for very good reason, the same one which makes it difficult to close the loop here. Personally I think this is a dead end and I am working to make a lightweightby jonnycowboy - General
QuoteKoko76 Good luck Paul, I believe that you will find "closing the loop" to be more difficult than you think. Modern machine tools still keep servo encoders on the motor shaft instead of the moving table for very good reason, the same one which makes it difficult to close the loop here. Personally I think this is a dead end and I am working to make a lightweight direct solution. I think I cby jonnycowboy - General
What about instead of Polulu replacements you use something like Dynamixel AX-12 or MX-12 servos? Then you save the 20$ controller (though the motor itself is more expensive). You also gain temperature and load feedback. Resolution can be pretty good depending on if you use the AX-12A (slow but accurate) or AX-12W or MX-12W (faster but less accurate).by jonnycowboy - General
Does anybody have a listing of all the extrusion lengths and how they are calculated? For example, for Alex's original Fusebox (1515) we have: 1515 Extrusion 380mm, 4 1515 Extrusion 330mm, 2 1515 Extrusion 345mm, 4 1515 Extrusion 300mm, 2 1515 Extrusion 250mm, 2 1515 Extrusion 152mm, 1 1515 Extrusion 386mm, 2 And in Culain's 2020 version it is: 4 x 345+ mm (Frame, vertical) 6 x 380 mm (Frame,by jonnycowboy - CoreXY Machines
Ax, are your designs up on Thingiverse? I am modifying the design for 20x20 with a 500mm "box" square, so I wanted to start with a design that it is already built thanks!by jonnycowboy - CoreXY Machines
Hi Toomas, have you finished your design? I want to build something very similar except using 40x40mm extrusion. 350mm heated bed. I will use laser-cut acrylic panels: 2 on top, 2 on bottom to solidify the entire structure. How have the prints been going?by jonnycowboy - Delta Machines
I'm not too worried about the gear ratio. I know others are using geared steppers with similar ratios to drive the extruders.by jonnycowboy - Mechanics
eBay page for 4roller extruder I saw this while searching for MIG drive rollers for my custom extruder. What do you think of this design? 4-roller (opposing) with a brass guide shaft for the filament between the two sets of opposing drive wheels. I would get all wheels to be driven with a gear off a single NEMA23 geared stepper (50 or 60:1). Any thoughts/comments? I am especially interestedby jonnycowboy - Mechanics
Hi Andrew, thanks for your reply. To be honest, I'm pretty impressed by the numbers you quoted!! I didn't think the repraps were that accurate. You mention the issues at speed, I expect my arm to have the same problems, especially with the high inertia of my system. I found a cheap worm/worm gear combination that I could use, it would bring my rotational resolution down from 0.09 to 0.002by jonnycowboy - Developers
I think something which is lacking on this site is a standard set of "calibrated" parts that each model could print out. Repeatability is the thing I think is missing for the transition of repraps from hobby to commercial-quality status. Dale, why would you say Z-axis is the most important? Because the model is sliced? I think that if you ask any engineer he'll tell you that all three axis arby jonnycowboy - Developers
ok ok tonightby jonnycowboy - Robots!
How many rep-raps do you know that acheive 0.1mm accuracy, repeatably? I would bet, almost none. In fact as you say the angular resolution is critical. I might switch to worm gears (if I can find some cheaply) or threaded-rods driven by stepper or continuous-rotation servo motors if I need more acuracy then the current servos will allow. Each servo I am using is 0.35 degrees. Ideally it woby jonnycowboy - Developers