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Re: Printing with the new t-glase from taulman3d - 10 years ago
Thanks for the info! The glass transition temperature affects softening of amorphous plastics mostly if I remember correctly. The more the plastic becomes crystalline, the more the thermal breakdown of the crystal structures affect softening. Given that t-glase is highly transparent, I doubt that the percentage of crystalline structures is high (else, refraction between amorphous and crystallineby uGen - General
Re: Printing with the new t-glase from taulman3d - 10 years ago
From your images, the t-glase looks quite pretty and the more complex objects are rather intriguing due to the translucency. I have a spool of PET from plastic2print which also prints very nicely - it is very transparent like glass and getting it to stick to the heated bed is very easy. However, the PET is very brittle and will shatter (or more like explode) into a million pieces when hit with aby uGen - General
Re: PLA, stainless steal and the nightmare it has caused me - 10 years ago
Quotethejollygrimreaper PTFE liners allow certain benefits over all metal one and vice versa, what i did notice is that you generally get better control over extrusion with a ptfe liner eg, start ,stop , consistency you also don't get the tipping point problem either (where you have a lowest speed limit which your filament can run through the hotend before it jams due to heat going up the filamenby uGen - General
Re: PLA, stainless steal and the nightmare it has caused me - 10 years ago
I second tkole in that the E3D design pretty much extrudes everything I feed it with. The massive crowd feedback/development cycle they conducted in this forum might have to do with the high reliability, I guess, as there were times where people had problems extruding this or that material and reported it for the developers to fix. So in a way, we also have to thank each other (or more specificlyby uGen - General
Re: Help on choosing the right hot end - j-head vs. magma - 10 years ago
If you are located in Europe (honestly, I don't know how much shipping would be to the rest of the world, though), you could go for the E3D hotend instead of the Magma. It's also an all-metal construction and many people including me have been printing about every material without problems, so it combines the best of both worlds with the downside that it is heavy and rather long compared to the pby uGen - General
Re: Let's implement colour mixing - [video] - 10 years ago
@bobc: Actually, thinking about it, do we really need to have complete volumetric information? What about assigning sampling points with certain parameters to the volume to let the slicer handle the calculations based on the distance to the points? I have tried to generate variable density infill in blender with a very similar method. You could for example use the physics and particle system to cby uGen - General
Re: Let's implement colour mixing - [video] - 10 years ago
Is this the way to functionally graded 3D printing? I see a bright future with objects having a stiffness/flexibility gradient and other fancy properties, but of course this requires volumetric 3D files. As long as the model is defined by its faces, truly blending materials to create gradients may only work with some slicer hackery. Maybe a clever script (e.g. in blender) can also be used to creaby uGen - General
Re: Layer Adhesion Problems with ABS-PC and Polycarbonate - 10 years ago
@tjb1: Thank you for the warning. Yes, I am aware of the maximum operating temperature of the thermistor. In fact, when heating the nozzle up, the temperature overshoots by 5-8°C momentarily. It didn't seem to affect the thermistor, though. @ShadowRam: I have a 150W PTC heater designed to be used with small fans. Maybe finally mounting this thing on my printer might help...The X carriage is craby uGen - General
Re: Filament diameter - differences between 1.75mm and 3.0mm - 10 years ago
I am running my direct drive without a grooved bearing successfully. The groove in the hobbed bolt/wheel is holding the filament sufficiently. Only if you don't use a filament guide at the point where the filament enters the extruder, you need extra guidance that the grooved bearing provides or so I read. As my filament path is extremely constrained by guides, I thus never ran into problems.by uGen - General
Re: PLA Gears VS ABS Gears - 10 years ago
@Ohmarinus: G7 bushings should work well with g6 shafts. If I understand you correctly, you have precision shafts? I think the tolerances are 10-30 microns, or 1/100th to 3/100th mm, but I don't have my tolerances lists with me right now. I can have a look at them when I get home, though. @waitaki: I think Ohmarinus meant to ask you whether you have a video of your PLA bushings. I would be interby uGen - General
Re: Layer Adhesion Problems with ABS-PC and Polycarbonate - 10 years ago
Success!!! Finally, I have been able to get PC-ABS to print well! As you can see, I have already done some destructive testing to see whether my enthusiasm was justified. And indeed it is. The mangled piece was first tested for layer adhesion by trying to cut along the layers. If layer adhesion is weak, I will at least be able to cut into the object or even split it apart. This was not quite tby uGen - General
Re: Rapid Tool-Head changer (very light multi-extruder) - 10 years ago
@ddseeker: Ah, I have seen the first animation a rather long time ago. Just didn't remember it. While I like the idea of a single motor to save cost, the penalty of that would be that you have to align the drive coupling precisely with the mating part. So either one would have to always calculate the current position of the motor coupling and save the positions of the extruder couplings or rotateby uGen - Developers
Re: Dissolving PLA without harm to cured Polyurethane/Silicone - 10 years ago
Any ultrasonic cleaning tank should do, too. They are available on ebay starting at <100€, for example.by uGen - General
Re: Digital Cytogenesis - Variable Density Infill made in Blender - 10 years ago
Sorry guys, I have been busy with other stuff, but here is the update on the printed part: hm. something went terribly wrong! I printed the part in PET for maximum clarity because I wanted to show off how awesome the voronoi cells look like in a printed part, but as it seems, the part pretty much looks like out of the RepRap stone age. Given its small size (25x25x25mm), I thought that the plasby uGen - Developers
Re: Rapid Tool-Head changer (very light multi-extruder) - 10 years ago
Thank you guys for the links, I will have a look at them... hehehe, food for thought... This method might work best for deltas, but if the mating parts are oriented in Z direction like on the Makerbot, the magnets have to be stronger to be 100% reliable, I suspect... That being said, I am also considering captive systems like this, but don't know yet whether they are practical at all in a CoreXYby uGen - Developers
Re: PLA Gears VS ABS Gears - 10 years ago
@Ramon88: Biodegradability of PLA is an overhyped property. Yes, PLA is biodegradable, but not in a scale that is in any way noticeable for the end user. To biodegrade this plastic, you usually need big industrial composting facilities with a controlled environment etc. @waitaki: Wow, that's far more than I have ever expected! Can you elaborate a little bit on which rods and lubricants you use,by uGen - General
Re: PLA Gears VS ABS Gears - 10 years ago
Yep, jamesdanielv is right - I have never used them because of what I have read. Now, you have piqued my interest. So, how long do they really last in your experience? @Ohmarinus: OK, maybe PTFE really helps with certain designs. It's just that it caused me more trouble than anything else. Maybe if you have small cavities in your bushings to act as a lubricant reservoir, PTFE lube works well. Myby uGen - General
Rapid Tool-Head changer (very light multi-extruder) - 10 years ago
Someone I work with told me of his idea some time ago: an extruder that can be attached to the carriage of the Mendel90 with magnets. At that time, I was rather suspicious about how well the whole thing would hold up during fast travel moves. But now, Makerbot released their new printers with magnetically held extruders in vertical configuration even, which got me thinking that this idea might noby uGen - Developers
Re: PLA Gears VS ABS Gears - 10 years ago
No, I just said that I have tried bronze bushings and found them to slide very well. Someone I work with prefers them over PTFE lined ones because he also had problems with the PTFE bushings. You might try to remove all lubricants from the shafts first. As far as I know, most bushings are designed to be used with no or minimal lubrication, so adding some might lead to worse performance. Fit and fby uGen - General
Re: PLA Gears VS ABS Gears - 10 years ago
That's strange. I have found several suppliers in the EU and UK: bearingboys in the UK, even offering machinable stock in case you need something custom. Metallbau Pietrzak in Germany. Got some from this one, rather decent, free shipping for some parts. Caspar Gleitlager, also in Germany. They are listing the tolerances of their bearings, which is rather helpful in my opinion. Last but not leby uGen - General
Digital Cytogenesis - Variable Density Infill made in Blender - 10 years ago
After seeing Neri Oxmans MIT Media Lab group work on functionally graded materials in 3D printing, but seemingly not continuing, I decided to do some research myself and bring this interesting topic to RepRap printing. Since we are pretty much limited to fusing filament together right now, I had to consider the limitations. Using gas to get porous extrusions for example is not really possible witby uGen - Developers
Re: PLA Gears VS ABS Gears - 10 years ago
Maybe PLA's impact resistance and overall mechanical strength also depends on layer adhesion. For example, I have printed with PC that broke and shattered rather easily because the layers were not adhering properly. Layer adhesion is best at around 210°C for PLA in my experience while anything under 200°C delaminated too quickly to be usable in mechanical applications. If the high temperature PLAby uGen - General
Re: Update on the E3D All Metal Hotend (Now finally shipping!) 
[Lots of pictures] - 10 years ago
Looks like quite a bit of over-engineering on Makerbot's side for just printing the standard stuff. They are practically encouraging their customers to print PLA designed their filament spool holders in a way that it would be rather difficult to fit spools from any other supplier on to. So high temperature filaments seem more or less not (yet?) to be the intended purpose for this hot end. Maybe tby uGen - General
Re: PLA Gears VS ABS Gears - 10 years ago
Strange, most people say that PLA is brittle, but in my experience, PLA (from plastic2print) was rather sturdy and held up against shock loads. Even tried to destroy parts with a hammer, but only succeeded after several heavy blows. The only downside I have experienced so far is worse temperature performance.by uGen - General
Re: Removing ABS print took flake of glass of the bed ! - 10 years ago
@bytemedwb: The strange thing is that I never witnessed chipping happening with window glass, only with borosilicate. However, window glass completely shattered more than once when the stress of cooling ABS parts was too strong, even with Kapton tape applied. That being said, the guys I work with and I usually applied extremely copious amounts of ABS juice to our build surfaces. I am back to Kapby uGen - Reprappers
Re: Renoving ABS print took flake of glass of the bed ! - 10 years ago
The same thing happened to the piece of oven glass of someone I know. He used ABS with ABS juice on it. The scratch theory makes sense in that it provides a starting point for the break to form, but we also noticed some wavy lines going through the glass, so maybe there have been some impurities in the glass or maybe there was some stratification in the structure itself (uneven cooling after manuby uGen - Reprappers
Re: color filiment - 10 years ago
In Europe, I have had good experiences with the filament from RepRapWorld (among the cheaper vendors, but apart of 3mm PLA occasionally snapping between spool and extruder when not printing for several days, rather reliable). Plastic2Print also is a good filament supplier with a wider selection of materials, albeit at a little higher price (tried their 1.75mm black PLA, PET and TPE). Unfortunatelby uGen - General
Re: IR heat lamp heated ABS build: - 10 years ago
I didn't read everything in this PDF on IR-emitting diodes, but what I understood from quickly glancing through is that we don't "feel" or see IR-A radiation on the retina. Thus, we tend to not avert our eyes when we gaze into such a radiation source and are susceptible to overexposure. Furthermore, cornea damage can occur in the same way that skin damage does by overexposure. Luckily, the Elsteiby uGen - General
Re: IR heat lamp heated ABS build: - 10 years ago
Wait a minute, what dimensions of PP stock are you talking about? Maybe successively heating single layers works well enough to be viable? PP seems to be generally available as plastic welding rod. Maybe 3mm is a little bit harder to find, but Orbi-Tech for example is one supplier to consider in Europe. Judging from some comments from the stone ages of the RepRap project, PP tends to warp quiteby uGen - General
Re: Dual Extruder mit einem Hotend - 10 years ago
@Mirco S.: Also sowas in der Richtung der Stratasys-Extruder? Hier ist ein Thread im Kisslicer-Forum, wo jemand ein Stratasys-Gerät auseinandergenommen hat. Könnte patentiert sein, das einzige Patent, was ich gefunden habe, ist aber ein wenig anders. Edit: Aha, hier ist das Patent. Ein wenig weiter im Kisslicer-Thread herumgestöbert...by uGen - Extruder, Hotends & verschiedene Materialien