Mike, it's very good to see you back in action!by rq3 - Tech-Talk
QuoteAndrew_F Thanks rq3, A local supplier had Nickel plated copper in C18150 (coefficient of thermal conductivity (k) ~ 324Wm-1K-1 at 20oC) at around 12 euro each delivered. C18150 is the alloy used in soldering irons. At the price, I bought one to trial. For comparison: Pure copper (Cu11000) has a k value of around 400 at room temp, with pure silver being 440 at room temp. At a guess, the aby rq3 - Tech-Talk
DiamondBack nozzles has met their Kickstarter goal, so my card has been hit, and I'm expecting my diamond nozzle in November. In celebration, I decided what the hey, and gold plated my pure silver heat block in anticipation. Meanwhile, while playing with Marlin firmware, I discovered a very old, and very serious flaw in Marlin. Apparently the Analog to Digital conversions in Marlin were all "cutby rq3 - Tech-Talk
QuoteAndrew_F This got me thinking.. Oxidation would be a problem on a copper block. Does anybody make/sell a nickel-plated copper heat block? Plenty of brass ("hardened copper") ones for sale on eBay, but brass and aluminium have similar thermal conductivity, so, aside from appearance, there would be little difference. Pure copper (Cu11000) and Silver have similar thermal conductivity A Niby rq3 - Tech-Talk
Quoteunialpha Hey guys, I'm having trouble when connecting this heating mat to my printer: it's 12V so I connect it directly to the D8 port in the RAMPS board. The problem is that although it should be able to reach 300ºC according to the datasheet, I am only able to heat it up to 50ºC with the printer. I think it might be do to its resistance (20 ohm), since heating cartidges are usually 10-1by rq3 - RAMPS Electronics
In Marlin, if you invoke sensor 1047 (a 1000 ohm platinum resistor temperature sensor with a 4.7k pull-up), you get crap results. Which makes sense, since the file for the 1047 sensor is basically a flat line. What am I missing? I understand that Marlin claims to "extrapolate" between points, but extrapolating between zero yields...zero.by rq3 - Firmware - Marlin
Quotedc42 QuoteMStarha I am using 300x300 mm Keenovo silicone heater on 5 mm thick 350x350mm cast aluminium plate. And I intend to print PETG and ABS mostly, that means up to 100-120 degrees on the heated bed. That might cause some stress in the glass. Will the ordinary float glass survive? Any thoughts on that? Float glass will be fine in that setup, certainly with PETG. I mostly print PETG, buby rq3 - General
QuoteMStarha I am building my CoreXY 3D printer with 350x350 mm heated bed at about 4mm thickness. I just found out that borosillicate glass is unavailable at the local glazier. He offered tempered or ceramic glass instead. Which one should I go for? I read that both are a more expensive option to borosilicate glass, but I worry about the temperature stability, warping of the glass (in case of thby rq3 - General
Quoteleadinglights I have just received the sensors and hope to work on them early next week. The plan is to set up some dummy beds - 220 mm square in 2mm and 4mm aluminium on my Cartesian Printer. I will initially try them in the manner that you designed them for and then look for areas where the signal might be compromised. To do this I will take the signal straight from the piezo to one of myby rq3 - Tech-Talk
The 99.9% pure silver heat block which I cast and machined is a close copy of the E3D V5 aluminum block currently on my prefered printer. Installing the same 24V, 30 watt heater cartidge in to it, along with the PT1000 sensor, yielded some interesting results. I used Repetier to monitor the temperature in all cases, and to invoke PID tuning. 1) It gets to temperature roughly 4 times faster. It tby rq3 - Tech-Talk
I've posted this elsewhere, but I think it's generally applicable to any print bed with a textured surface. The Anycubic Ultrabase is a glass bed, with a fired on microscopic ceramic "waffle iron" pattern. I never had good results from it, until I discovered that the manufacturing process could leave traces of flux in the grooves of the waffle iron. Which explained the varying results folks got fby rq3 - Tech-Talk
My delta uses 100K NTC thermistors for the bed and hot end. In preparation for the PT1000 platinum hot end sensor, I flashed Marlin with the hot end sensor appropriately changed (from Type 5 to Type 1047). I then taped the sensor to the bed, and set the bed for 100C. It tracked quite nicely, but the reading "bounced" between readings about 3C. No way the heavy glass bed was doing that, so I soldeby rq3 - Tech-Talk
Quoteleadinglights I have ordered an AXE027 cable and will download the software and drivers. I will run some tests and report back with results. Mike They are on their way. You should find that they act like an automotive engine knock sensor, insensitive to noise and vibration, but immediately responsive to a very light impulse anywhere on their mounting surface. Originally, I had mine mountedby rq3 - Tech-Talk
For mad scientists like ourselves, the McMaster-Carr website is absolutely invaluable. I don't believe they ship internationally, but their website is one of the most useful resources on the web for generating ideas and further leads. Just search on "tubing", plug in your size and pressure requirements, and watch the light-bulb go on. Plus, almost all of their hardware has directly downloadablby rq3 - Tech-Talk
Quoteleadinglights I am hoping to pick the minds of somebody on this forum who may know where to get small diameter reinforced flexible tubing. What I need is something with a bore of about 2mm which is able to deliver air at a pressure of about 10 bar (1.0MPa, 145psi) while being both flexible and lightweight. The need for this is to deliver air for "near field" part cooling immediately after tby rq3 - Tech-Talk
Quoteleadinglights PM with address sent. I agree about automation having unpleasant surprises for the unwary. My own favorite aircraft was a Piper J3 "VP-YEM" without so much as a starter - the only electrics were the mag switches Mike Got it. I'm shipping tomorrow (Tuesday) via USPS international priority mail (I think). Customs will be declared as zero value electronics samples. I'm sendingby rq3 - Tech-Talk
Quoteleadinglights A nice demonstration, but for my peace of mind that it is truly consistent, can you try the following. Get a map of the surface using at least a 5 by 5 grid and save the readings. Move the sensor to two other positions fairly far from, and not symmetrically the same as the first position Repeat the mapping of the surface for each new position. Compare the grids, subtracting eby rq3 - Tech-Talk
QuoteVDX ... when I was at university at end-80, we sometimes used gold-O-rings for UHV assemblies for GSI and Cern ... but as they were pretty expensive, whe had to "track" them constantly and return with "same weight", when dismantling the assemblies eventually From this time I have only a bunch of Aluminium O-rings for random use ... but, years later, got some 99.999 gold-cylinders (each 2gby rq3 - Tech-Talk
While I wait for my diamond nozzle, I realized that I had never posted a video of the TAP-XXX piezo nozzle contact sensor. I've been using it regularly for months, and just recently realized a very cheap and quick improvement involving "O" rings. Gerber, STL, and DOCX files are available if anyone is interested. So here it is:by rq3 - Tech-Talk
Quoteleadinglights I did not realize that platinum RTD sensors were available at low cost and in small sizes. The last time I used a PT100 sensor it was fiercely expensive, quite bulky and needed a dedicated amplifier. For the time being I will stay with my thermocouples for the reasons stated earlier but hope to find a project where I can use a PT1000 sensor. In passing though, to go with yourby rq3 - Tech-Talk
I've decided to go with this: Costs about $1, should last forever, good to 600C, and directly interfaces to the existing ADC pin.by rq3 - Tech-Talk
QuoteVDX ... for high-temp measuring and temp-controlling I were using PT100 and NI200 sensors with high resolution 24Bit AD-controllers (AduC847) -- for testing and adjusting I've combined two PT100 "back to back" and heated (and measured) of up to 800°C with them (they were max-rated for 650°C) Beside the common "flat" type there are cylindrical 2mm-types in a ceramic housing (could be aluminby rq3 - Tech-Talk
I designed and manufactured my pure silver heater block with the idea of mounting the temperature sensor, in the form of a ring lug device, under an Inconel Belleville washer between the nozzle and the sensor. Methods of establishing the correct crush of the Belleville washer are not germane to this discussion ;-) My design requirements are 500-600C maximum temperature, and interface with existiby rq3 - Tech-Talk
After wandering into my local car repair garage, and convincing them to fire up their oxy-acetylene torch to melt pure silver grain into my home-made molds, I chucked the results in my lathe to roughly face them off. I'd heard all kinds of horror stories about machining silver, but it was very well behaved. Nice clean curling chip using a fine grain carbide tool, zero top rake, no coolant, a bitby rq3 - Tech-Talk
QuoteVDX ... I think, this has gone wide enough - I have not other solution against this ongoing "flame-war", than ban the user "ayozek" ... but will leave his threads visible for a time being (all the threads are in my backups, even with all the 100+ edits of them, which he did to "solidify" his stand). It's sad, how such a situation could start and thats not possible to clear it in a sound wayby rq3 - Administration, Announcements, Policy
Quoteleadinglights The figures I get for volumetric heat capacity are from and I get J/g.K g/cm3 J/cm3.K Aluminium 0.900 2.7 2.4300 Silver 0.233 10.5 2.4465 Copper 0.386 8.9 3.4354 The thermal conductivity of Aluminium alloys is significantly worse than pure Aluminium, but compared wiby rq3 - Tech-Talk
Quoteleadinglights I would be interested to see what your results are as I looked in some depth at various materials and geometries for hotends and came to the conclusion that the race is a lot closer than you might think. One starting assumption that I used is that having a high specific heat is a good thingas it acts a a heat store while the heater is trying to catch up. From this point of vieby rq3 - Tech-Talk
With the VDE-100 Schnekenstruder working as expected, and diamond nozzles on the way, it was only fair to make a proper heat block to mate with my tri-metal heat break. So I ordered 3 troy ounces of pure silver casting grain, and spent some time making molds from 3D printed forms. Why silver?: Cons: 1) It's expensive. Currently $20-$30 per troy ounce. The heater block will weigh about an ounceby rq3 - Tech-Talk
QuoteMikeCL I'm still trying this out since I upgraded to the new Marlin version Im running the delta calibration I'm at Iteration:5 and it seems to just go over and over again not stopping is this normal? Yes, it's normal. It will continue to iterate until one of two things happen: 1) It meets the "tolerance spec" in the Marlin G33 cpp file (the best result of the iterations), or 2) It gets toby rq3 - Firmware - Marlin
QuotePCR This is about the 5th time someone's linked to this video. It's a completely different mechanism.by rq3 - Tech-Talk