There are a lot of nice features on the new machine like the motor detection not requiring end stops and the sophisticated filament jam detection or the auto power or the ability to change filament during the job. Wow that is a lot of features and that's only the start! It seems that most of the improvements are due to a new controller board. I'd like to get 3dprintingmeathead to comment since he's changed his mainboard.
Joe also says they've gone 24 volt, the DP3/5 already uses 24 volt and it's one of the reasons I got mine. I've seen the damage done to the 12 volt high current connectors and I didn't want any part of that.
Notice the extruded rails. We've got that in spades and most of the members including myself have even upgraded that with the addition of corner brackets and gussets.
If you look closely at the Z axis you can see they've removed the couplers and have gone with steppers that have the acme rod instead of the tiny D shafts. I've seen other hobbyists make this change and I was thinking about it myself.
Speaking of the Z axis those steppers look larger than ours, going to larger steppers would require quite a bit of a redesign. I wonder if it would help any?
The entire extruder mounting bracket looks like a new design with a flat fan. Many of the members here have gone to the flat fan design when they upgraded the part cooling fan but I chose a design that used a larger radial fan and I think I may have to reconsider that decision.
Prusa seems to avoid the Bowden and have continued with that decision on the new machine.
Post by 3dprintingmeathead on Oct 21, 2017 21:59:27 GMT
Wow, a lot to go over, I'll hit what I can here: 1) the power supply will be the limiting factor when it comes to powering on/off the printer. The stock board has a control output built in, but an act power supply is required to remotely disconnect power. I personally feel the power supply that comes with the printer is not worth replacing, and also, the mechanical shutoff is great for me as a safety precaution, and it allows me to monitor my extruder temps before shutoff to prevent power down heat creep and jam.
2)the board has plenty of sparee inputs for endstop that I believe wouldn't be a problem to dedicate to a filament sensor The real challenge would be writing the firmware to work with the sensor. But I have not researched how exactly the filament sensor works. I do know it also senses motion of the filament as it will pause a print when it senses a jam.
3) I do feel a blower fan is far superior to an axial(?) Fan, because the axial fan is capable of volume, but not pressure. Since these fans are used with a duct that redirects and shapes the airflow, pressure is just as important as volume here.
4) Integral lead screws I think are overkill. If you have to crank out 50 printers a day, they save on assembly time, and they can be better quality than separate lead screws, but really it'll perform the same as separate lead screws, and having it separate is a lot more spare parts bin friendly. As far as the size of the motors go, they really do not have to move much weight, and they certainly do not have to move it fast. An easy way to greatly increase torque is to replace the 8mm/rev lead screws with 2mm/rev lead screws(something, ironically, you could not do with integral lead screws) I'll have to read your post again about some of the other topics you have brought up