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I'd like to warn everyone from using Prusas SLA or other cheap (Chinese) SLA printers instead of a Form 2. The Form 2 has a cartridge system for the resin. The cheaper SLA printers don't have that so you are a lot more "in contact" with the resin. This makes the whole process a lot more difficult/complex and might even be harmful to your health. 😐
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The RSNA/SIG released a paper about guidelines for medical 3d printing. Download link e.g.: Radiological Society of North America (RSNA) 3D printing Special Interest Group (SIG): guidelines for medical 3D printing and appropriateness for clinical scenarios On page 7 there is an interesting table with ratings from 1-9 about the usefulness of 3d printing on specific medical scenarios: 1-3: rarely appropriate 4-6: maybe appropriate 7-9: usually appropriate
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Comparing FDM multi material options: Prusa MMU2 and Palette 2+
Flaviu posted a topic in Hardware and 3D Printers
After several weeks of multi color/material printing with my FDM printer Prusa MK3 (I have other Printers too) with the Multi Material Unit 2 (MMU2) I'd like to share my results with you. Another interesting product regarding multimaterial is the Mosaic Palette 2. I don't own that unit at the moment but I know people who are using the system and I talked a lot with them about the unit so I will share their experience also with you. First of all, some general info. The Prusa MK3 costs as a build kit 769€ and fully assembled 999€. The MMU2 unit comes only as a kit and costs 300€. It can print with up to 5 materials. It can only be used with a Prusa printer out of the box. (Firmware is open source so in theory you could tinker it to work with other printers). Prusa has also their own (open source) slicer called Slic3er PE. The Palette 2 comes in two versions, the standard and the pro. Both versions can print with up to 4 materials. I highly recommend the pro version because it has a better warranty and comes with better quality parts. I also recommend the canvas hub option because it makes it easier to connect the system to your printer. That would result in a total prise of 878 USD. The Palette 3 can only be used with 3D printers that use 1.75 mm filament. So it can't be used with something like an Ultimaker. One more thing about filament. Prusa has now their own filament called Prusament. It is produced with a tolerance of +/- 0.02 mm in diameter. And you get a QR code with your spool to check the measuring yourself. Every spool is measured 100%. One (and only) advantage of the 2.85 mm filament that Ultimaker is using is that it is easier to produce precisely. If you are using 1.75 mm with +/- 0.02 mm that advantage is gone. First some thoughts on the MMU2. The MK3 produces very nice quality prints especially with high quality PLA like Prusament or PLA/PHA. That is mainly thanks to the Bondtech direct drive extruder. One other nice feature is the removable (magnetic flex steel) PEI bed. I guarantee you that if you are using this feature one time you will never never ever want a printer without it again. The basic principle of the system is that it adds a bowden system with a selector to the direct drive system. So the direct drive system pulls the filament up until the bowden system takes over. Than it switches the filament and the bowden system pushes the filament back to the direct drive gears. And so on ... As already mentioned it comes as a kit. And that is a BIG problem. Assembling it is not easy because you have to make sure that the filament path is as smoothly as possible. When you pull filament out from the hotend you can have tips with large strings or increased diameters. That will cause problems. To form the tips Slic3r PE has something called "ramming sequence". It tries to "form" the tips nicely like with no strings. This works good with Prusas own filament Prusament. It works also usually quite good with other filaments especially high quality ones like PLA/PHA. But there is no guarantee it works with the filament you are using so you might have to try different settings. So you have with the MMU2 basically two main problems. Assembling it so that everything runs perfectly smooth. And getting the ramming sequence settings right. A LOT of people are having problems with that. I had also try a lot out and it was frustrating at the beginning. I have now a working unit and prints are imho amazing. Now some words about the Palette 2 (pro). The principle of the machine is that it cuts the filaments and than splices them (melting) together. So you have one filament going out of the system with the right color combination for your model. It comes basically fully assembled. Installing the system to your printer takes maybe half an hour or so depending on your setup. So a LOT easier that the MMU2. One big problem right now is that their own slicer is very buggy and produces (especially on complex models) mediocre print quality. Sometimes it does even the color changes on the wrong location of the part. Combining your own more sophisticated slicer like Slic3er, Simplify3D or Cura with their system works also not reliably at the moment. Some general thoughts. Both systems produce purge towers. Every time when you change the color you have to get rid of the plastic from the old color in the hot end. How much you have to purge onto the tower is color dependent. E. g. switching from black to white or from PLA to BVOH as extreme scenarios. BUT as I mentioned the Palette splices the filaments together. That produces a color gradient in the filament of a few mm. That has to be purged additionally. So the purge amount of the Palette will always be bigger than the one of the MMU2. Slic3er PE has the option to "purge into infill" so it purges also into the objects infill. That option will come to the Palette 2 in the near future. I print a lot with BVOH and I know that it can work with the Palette too. But in both cases it adds complexity. Slic3er PE has the option for printing only support interface layers or completely supports with soluble material. I will start testing flexible materials in the near future. Customer support is pretty good with both companies. The forums are used very actively and you have also a very helpful chat support at Prusa. MMU2 Print: MMU2 Print: Kidney with tumor and magnet inserts MMU2 Fun prints: Palette slicing problems: Palette color gradient: -
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There is a game changer on the SLA front - Josef Prusa made an open source SLA printer - Prusa SL1. You can buy two of those and one Prusa MK3 with the money for one Form 2. It prints down to 10 microns layer thickness (after some tweaking of the slicer). It is open source, which means that the wave of cheap prusa clones is coming. This will change the whole SLA sector because let's face it - with the money for one Form 2 you can buy a whole 3D printer farm with the best printer of Winter 2018 (Prusa MK3) or you can buy two printers of the same class, with the same parameters, which requires more tinkering and experienced staff. The bad side about the Prusa printers are the limited Wi Fi options...
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