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geert_2 last won the day on December 10 2020

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  1. Yes. These models were designed a couple of years ago for single-nozzle printers, and older slicers. So they are all printed with the exact same settings. Sometimes I provide gaps to make removal easier, so that parts are only kept in place by strings, not modeled connections. I consider these supports an integral part of the design, not a separate add-on later. Similar to when designing for injection moulding, then you also consider the fabrication method and aspects from the very beginning. These are all very small models, so reachability and removability of the suppo
  2. I often design custom supports in CAD, as part of the model, and then turn the slicer-support off, like gr5 said. Then you have full control. General supports are great for general items. But special models may require special custom solutions. Yes, custom designing them may take quite some time, but you win that back when it prints well and does require less post-processing. For example, see the pink and orange supports in the first pic. This model is too small to get in with a knife or plier to remove standard supports. Now I can easily grab them and wiggle them loose.
  3. If you can't find the official oil, I think a fine oil for light machinery and house-hold stuff should be okay. For example the sort that is used for bikes, tools in the workshop, model trains, etc. As long as it does not dry out into gum, like mine did... But I didn't have a good quality fine oil, and I had 100 liter of hydraulic oil spare, so I gave that a try... Don't use thick oil (thus no grease, no high-temp oil, no car motor oil, etc.), and don't use thin dislodging oil (does not lubricate well). You can feel if the rods are too dry. Switch off the printer, and g
  4. I do it very similarly. First, moisten a tissue with isopropyl alcohol and wipe the rods to clean them: they collect lots of dust. Then moisten a tissue with a drop of oil, and wipe the rods to oil. Never pour oil on the rods directly: it will be way too much, and you don't want oil leaking on the glass, or on the rubber belts. Ultimaker recommends a light machine oil, if I remember well. However, I once had sewing machine oil from a sewing shop, but that dried-out fast and turned into gum. So, now I use thin hydraulic oil, because I have lots of spare of it from our hydraulic test
  5. The companies Materialise, Melotte, and Protolabs do metal 3D-printing. Maybe you can find the info you are looking for at their websites? Including guidelines for dimensioning? I think the models shrink a bit, but I have no experience and knowledge about this myself.
  6. When making tiny filters for a vacuum pump, I had to print them very slowly and in very thin layers. Otherwise, if printed at 0.2 or 0.3mm layers, it had lots of tiny openings, through which tiny jets of water squirted out, similar to out of an injection needle. When printing at 0.06mm layers and 25mm/s in PLA, it was water-tight. But if you are going to print your huge model at such a low speed and layer height, it is going to take forever. So, I would make a *small* test model first, and see how that works under high pressure. Put tap water on it, or even via a high-p
  7. My first thought was: "dirty glass". If you clean it with soap or window cleaner, be sure to clean it again afterwards with pure warm tap water only. Best twice. Thus no more soap. The reason is that soap reduces bonding too. So you really need to remove all traces of soap and detergents. Don't ask how I know this. :-) After a closer look at your photos, it looks like the bottom "sausages" are quite round, not very much squeezed into the glass. That could also reduce bonding. So, in addition to cleaning, I would also check bed leveling, and bring that closer if necessary.
  8. At first, I thought: are you really going to slide downhill in a 3D-printed sled? What if it breaks? But then I saw the dimensions: 12cm. :-) The first photo, it laying upside down, looks really convincing.
  9. Thanks for the feedback, it could indeed help people in similar situations, even for other printers.
  10. Do the walls need to be slanted for cutting cookies? For injection moulding plastics, for sure yes, for casting silicones also yes, unless the models are very thin. But for soft cookies or dough? If I had to print cookie cutters or plasticine cutters, I would probably first try straight walls, print with a standard 0.4mm nozzle (less risk of underextrusion and clogs), 0.8mm thick walls (=2 lines), print slow at 25...30mm/s, thin layers 0.06...0.12mm, and print cool at the lower edge of the temp range. Printing cool helps prevent the filament from decomposing in the nozzle due to th
  11. This looks like severe underextrusion. It could have lots of reasons: user gr5 has made a good list and tutorial video on this. See if you can find it here on the forum (I don't know the links), and check each item on the list. I once made underextrusion tests. Your models look a bit like the 80-90% in my tests. This is PLA. (Lack of light, translucent filament, and narrow depth of field of the camera don't help the photo quality, but you get the idea.)
  12. If you could redesign the overhanging rings to be at 45° or 60°, instead of 0° (where 0° is horizontal and 90° is vertical), they could print without supports. I don't know that machine, so I don't know if these rings are functionally required or not? Or if they could do with a shallower angle? That would seem the best option, if functionally possible, since you don't need supports then. If you do need the rings at 0°, and thus do want supports, but you don't want them to go all the way down, you could also design custom free hanging supports, like I did in these models. But test t
  13. I don't know your printer, but it looks like it still needs calibrating steps, and maybe correcting slack and tolerances. You may need to find manuals and tutorials on that for your printer, or ask the manufacturer. After that, for finding the best settings for general printing: just stay with the printer and watch it closely, while printing small test models. Do lots of test models, one by one. Change speed on the fly, and see how that affects the print quality. Change temperature on the fly, and see what happens. Change cooling on the fly, change flow-rate, etc... Print the same
  14. Yes, just print enough skirt priming lines around the object: 5 for a bigger object, 10 for a tiny one. And while it is printing these, turn the bed-adjusting screws until you get the desired thickness and squeezing of your first layer.
  15. For sealing seams, maybe you could also make your own custom gaskets? Print a mould, and pour silicone in it, the kind of silicone that is used for, well, mould-making. Be sure to smooth the layer-lines of the mould, otherwise removal of the silicone will be difficult. Silicones come in various hardnesses, from flesh-like up to tire-like.
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