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Fan backwash problem - new parts to fix - 11 years ago
Hi All There was an old thread in which Markus revealed that the fan backwash causes distortion of large area printing. Now it seems several of us have been working on possible solutions. I am going to post the fruits of my work here and I ask others to do the same, at present the discussion resides in a thread about cheap filament. Roryby Rory166 - Ormerod
Re: Cheap ebay filament - 11 years ago
Hi All May I suggest this thread has gone substantially off topic I only found this important work by accident. Fabulous work is being done on the backwash problem but the thread is about cheap filament. If its ok with everyone I will start a new thread on Fan backwash. Roryby Rory166 - Ormerod
Re: Head sagging again - 11 years ago
Simon I think for safety the sensor should be 1.5mm from the reflective surface as a minimum. Your new design looks even better. David I am almost certain that RRP use only PLA from Haberdashery. I think there is a bit of a green agenda here so even if ABS were more suitable for certain parts in will not be used. Roryby Rory166 - Ormerod
Re: Head sagging again - 11 years ago
Simon Part looks absolutely brilliant. May I make one further suggestion, if the protruding part was made 1 mm deeper at the bottom face it would enable the head to be a bit lower for the correct operation of the z sensor as per an earlier post. Roryby Rory166 - Ormerod
Re: Duet 3.3V supply quality - 11 years ago
Hi All DC has sumarised the situation well. Using the 12V rail and internal converter there is an inadequate margin. With 5V and USB there is no margin. Has anyone tied the following? Put neither link in place,ATX 5v nor enable 5v converter. then feed 3.3V to the tab on the 3.3V regulator from the ATX power board. Rory Edit I have clearly got this wrong the 5v from the ATX would need tby Rory166 - Ormerod
Re: Head sagging again - 11 years ago
Hi Simon Looks great can you put it on thingverse? Looks to me if the holes are just slightly too far from the edge and that is what is causing the droop. Roryby Rory166 - Ormerod
Re: X-carriage slides off bearing - 11 years ago
Hi Dsred Looking at my printer and wondering how to stop the bearing coming out of the slide. First thing that comes to mind, is the bearing running free on the shaft? It is hard to see how enough force could be generated to move it out of the carriage if it was free. The instructions said nothing about lubrication but some light oil in the bearings seems to be good. There is a grove in theby Rory166 - Ormerod
Re: Duet circuit diagram - 11 years ago
DC Interesting that you have an Alpine, mine is ACE I had assumed everyone had the same. I think they are the same just supplied with a different badge like Austin and Morris used to be in some rotten best forgotten motoring years. I agree with what you say but I just prefer to separate big currents when possible, Roryby Rory166 - Ormerod
Re: Cheap ebay filament - 11 years ago
Iamburny these are clearly 1 Kg reels. Very similar looking ads from other sellers say 1 Kg. Seems like this guy is referring to the total weight of the package. Should you measure the filament to make sure it is the same dia before doing this sort of thing? Your print looks fabulous, how is it all going? How did the build go? This forum is full of people who are having problems. I agree aby Rory166 - Ormerod
Re: Duet circuit diagram - 11 years ago
Dennis I have not read every word of this thread but I agree with you completely. The driver output for an external Mosfet is provided. There is a separate 4 wire plug from PSU to power board, this would be ideal to run the bed heater with no sharing of supply or common right back to the psu. The only issue in my mind is if the driver and ground are taken to an external mosfet on the power boby Rory166 - Ormerod
Re: Y-axis endstop black wiring connectors - 11 years ago
James Are you saying your machine has no serial number at all? This seems odd as RRP seem to set some store by asking what serial number you have when getting support. Clearly they should not have to support replica machines. Who is going to be first with producing replica machines? I am sorry to say that in my over inflated egotistical opinion this picture is worth a thousand words in termsby Rory166 - Ormerod
Re: Head sagging again - 11 years ago
Treth I like your thinking. In an earlier thread we were discussing how to get 1.5mm minimum Z-sensor to bed clearance. I am now looking at the printed part and thinking "There are forces at work here of which we know nothing"( small prize for the person who spots the origin of this quote). What I am alluding to is the three colour printing head. The design of this part seems to make littleby Rory166 - Ormerod
Re: Head sagging again - 11 years ago
Hi All Can I suggest the following belt braces and suspenders solution. Replica of MDF insulator both in 8mm alu strip and MDF. Redesign the part deeper so the top part above the screw is a reflection of below screws, close the ends of the slots both above and below screws and re print in ABS. Above fit the alu plate and mdf with longer screws and then attach heatsink. I have asked my designby Rory166 - Ormerod
Re: Extruder motor - possible board problem? - 11 years ago
As with the x-axis slider the 3mm washers can jam up the 9mm bearings in the extruder. I recommend dismantling the extruder and turning down the diameter of the washers to about 6mm. You can use an electric drill with 3mm screw and nut to hold the washers. Then a file to remove the excess. Do 3 washers to have one for the x slide. Roryby Rory166 - Ormerod
Re: Duet 3.3V supply quality - 11 years ago
Hi Ray So you are saying if we do the differential technique on the 3.3v o/p and round of the regulator and we still see this problem then it's really there? No worries abut the safety earth on my scope it hasn't got one. Roryby Rory166 - Ormerod
Re: Z axis still missing steps, or another problem? - 11 years ago
Hi All What about drilling and tapping the cog for a metal grub screw. This should provide a more positive fixing after all any backlash is undesirable. Roryby Rory166 - Ormerod
Re: 5V Supply - 11 years ago
Quoteejg Greetings. As someone completely new to 3d printing and forums here goes. I'm the proud owner of RS Ormerod number 425. Reading through this forum I see several mentions of no 5volt supply except through the usb. I am suffering this issue. I placed the jumper on jp9 but this makes no difference and since my unit is out of the 1 - 220 range mentioned I believe it should receive 5 volts viby Rory166 - Ormerod
Re: Blown bed heater switch circuit - would like to fix it? - 11 years ago
Hi Andy How odd for the driver to blow rather than the power device. I am thinking I don't want the bed supply sharing the common ground with the electronics. There is an output connector to use an external Mosfet. Tr1 is still required so that doesn't help you. Roryby Rory166 - Ormerod
Re: Duet 3.3V supply quality - 11 years ago
Radian Have you measured the current drawn by the duet powered from usb? My laptop gave a message saying usb cevice drawing too much power which might indicate exceeding 500mA and that was with nothing connected like IR position board for example. I agree the regulator might be improved, RS have a 1A device which although slighly bigger might well fit. 36p but you have to buy 25 off. I am thby Rory166 - Ormerod
Re: Fine threads and rough edges when printing - 11 years ago
DC My build has stalled at the hot end stage due to some kind of bug that has struck the whole family. I have been lying in bed with my laptop enjoying others experiences vicariously. One thing that is certain to me is that more air will splill ot of the heatsink vents than comes out of the tip cooling jet. Although these vents are positioned between the jets I strongly suspect they will defleby Rory166 - Ormerod
Re: Bearings making an awful noise - 11 years ago
Hughsie It was never mentioned in the build instructions but light non acidic machine oil seems to be the concensus. In prctice that probably means 3in1 oil. Rory PS. Just seen Ians reply. Customer service in 48 minutes after 10pm on a Sunday night. Hard to beat that methinks.by Rory166 - Ormerod
Re: Duet 3.3V supply quality - 11 years ago
Hi All Just attached a scope to my duet. Confirm Radian's results entirely. Infact I saw negative excursions on the +3.3v rail. Radian does not have a one off faulty board. My setup had no connection to the mains being powered from my laptop via usb, the scope also running on battery. It seems that significant RF can be picked up in a usb lead but the fact that the 3.3v regulator appears toby Rory166 - Ormerod
Re: Fine threads and rough edges when printing - 11 years ago
DC Not a "disaster darling" its a work of art. Call it "My Vision of Chaos" and enter it into next years Turner prize, should be a shoe in, don't forget I'm due a drink when you win the 25k prize. I have now completed a prototype deflector had intended to use aluminium but some clear plastic was the first thing that came to hand. At least you can see what it is, easier. There are 5 x 3mm wasby Rory166 - Ormerod
Re: Fine threads and rough edges when printing - 11 years ago
DC I am no expert but from fundamental priciples I wonder if the head simply dribbles. I would try reducing the head temperature to have the material not so liquid, which is what you have already done but try more. Perhaps reduce the bed temp as well. The 10mm ok is a clue, pehaps general air temperature around the model increases as the print gets underway. I have spoken to a contact who haby Rory166 - Ormerod
Re: Duet 3.3V supply quality - 11 years ago
Treth I assume it is normal to use attenuated probes whenever possible to minimise cicuit loading. Normally 10:1 but 100:1 does exist and probably more. At work we were always told to have 10K resistors in our DMM voltage test probes but we never bothered. I have heard of something called FET probes. Not sure but if you put a Mosfet on the end of the probe with just the gate connecting to tby Rory166 - Ormerod
Re: increase print resolution by increasing stepper resolution possible? - 11 years ago
Hi Minlin I understand stepper motors can be microstepped. Not an expert you understand. This would appear a more promissing aproach in that you would not experience any slowing or gearbox backlash. One thing I have read is that there is no holding torque on a microstep. I asume therefore that it would be better to hold on a full step while operating other axes. This might complicate the fiby Rory166 - Mechanics
source for T-Nuts - 11 years ago
Hi Does anyone have a good UK source for the M4 slot6 T-Nuts as used with extrusion with 6mm slots eg. Ormerod. Roryby Rory166 - Mechanics
Re: How to hold the bed down? - 11 years ago
DC Superb pictures, what sort of camera do you use? I suspect the MDF pieces go the other way up than shown in picture with cardboard. Do you glue the MDF to the cardboard? Otherwise how is the cardboard fixed? I would counsel against using PLA printed part instead of MDF due to temperature. Roryby Rory166 - Ormerod
Re: Duet 3.3V supply quality - 11 years ago
Treth Very intersting. I have never heard of anyone putting ferrites on their scope leads before. I have recently purchased a Hantek battery powered 60 MHz 1062B but yet to use it in anger. The chinese throw in FFT while TEK make you pay through the nose for a dongle. My previous employer was spending so much on Tektroniks they decide it would be cheaper to buy the company instead, so they dby Rory166 - Ormerod
Re: What's inside an ACE ATX psu - 11 years ago
DC42 Now in posession of schematic, I don't think changing the driver will have the effect you desire as it is not in series with the gate, however putting a cap on top of R20 300K whch connects the gate to ground should slow up the switching. Still a bit early in my day to work out a value to give the apropriate rise time, bearing in mind it is not the rise time on the gate that matters butby Rory166 - Ormerod