5 ms·
The price is going to slay all Chinese crap makers. I always wanted mk3 but never had a big enough reason to buy, now I can justify it. It's the printer I will
by mk3 7y ago
The price is going to slay all Chinese crap makers. I always wanted mk3 but never had a big enough reason to buy, now I can justify it. It's the printer I will buy :)
- m0xte 7y agoIt’s not. I bought an Creality Ender 3 recently for a lot less than that (152 GBP next day in UK) and the thing is perfect. It is also entirely open source. https://github.com/Creality3DPrinting/Ender-3 https://github.com/Creality3DPrinting/Ender-3 Quality is pretty top notch. It worked out of the box flawlessly and with no futzing.
- crankylinuxuser 7y agoYeah, except for the things you can't see. 1. They use crappy MOSFETs that are known to fail closed. This means you can get a runaway heat on your hotend. A 40w cartridge can melt the alu heatspreader 2. The beds are anemic for heating. Not enough power 3. Crappy steppers 4. No features for jam detection, autoleveling, skipped step protection, filament runout 5. "Chinese" quality: good luck in getting any sort of tech support. Once they have your money, you're fucked. I'm fighting right now with Pine64 over defective eMMC modules that ignore the first read, causing initrd to fail to boot. Of course, they were chatty on Twitter prior to purchase, but have ignored every way of contact AFTER purchase. But pretty much every Chinese company is like this.
- m0xte 7y agoNote: former EE. I’ve taken it and the provided power supply to bits before I even fired it up. 1. They’re IRLR3103PBF operated within their SOA. They’re fine. Most MOSFETs fail short due to the construction of the MOSFET. I’ve actually got a few scars on my arms from the buggers exploding on me misusing them on purpose as RF PA’s as a ham. I’ve seen them blow up in various bits of expensive US made kit too (tektronix 22xx in particular grr) 2. I’ve had absolutely no problems at all with mine and adhesion. 3. A decent stepper costs as much as a Prusa i3. All the steppers at this price are crap. But they work pretty damn well. 4. These are luxuries really. If it jams the Bowden tube pops out and you clean it up and off you go. I levelled it in 3 mins myself. Skipped step I’m not sure if the scenario. Filament run out doesn’t happen if you pay attention to the Cura filament length and don’t try to wing using up the ass end of a roll. 5. I’m not paying for support. I’ll fix it myself. I’m quite handy with a screwdriver, a compiler and a soldering iron. The thing is just an AVR running open source firmware. Nothing complex. The main thing is I can get functional chunks of spare parts for this next day via eBay. As for comparing Chinese support to US support, I’ve had better luck out of the worst Chinese company than Microsoft and Apple.
- jrockway 7y agoI think he is referring to a step motor controller as a "stepper". People love the fact that Prusa uses Trinamic drivers instead of no-name drivers. I personally don't understand why step motor control is something that needs to be outsourced. Just stick an H-bridge between the microcontroller and the motor and improve the control algorithm with every release.
- m0xte 7y agoThe “no name” drivers are a bit more complicated than an H bridge: https://www.pololu.com/file/0J450/a4988_DMOS_microstepping_driver_with_translator.pdf https://www.pololu.com/file/0J450/a4988_DMOS_microstepping_d... The typical H bridge has many failure modes and disadvantages which are handled by the controller ICs. Not to mention a lot less CPU overhead for the AVR running the show.
- jrockway 7y agoYeah, you can get some feedback from the controllers easily (and then omit physical endstops). I am waiting for a 3D printer that uses servo motors, though. So many failed prints come from not knowing where the extruder is. But you can just measure exactly where it is, rather than guessing based on how much current the motor used.
- taneq 7y agoServos don’t actually gain you that much. If you’re meeting enough resistance to skip steps then your print is wrecked anyway.
- imtringued 7y agoServos will easily triple the cost of the printer.
- IshKebab 7y agoI've done manual h-bridge style control and it just can't match a proper driver. You're going to get a ton more vibration and less power. I use Leadshine ones normally. They're big but also very reasonably priced and work very well.
- taneq 7y agoI have a CR-10 and it’s been great. Worked out of the box and never skipped a beat.