OK, I’m still trying to configure and optimize the MakerBot Cupcake I have; it’s a basic version, DC extruder controlled by PWM, I choose usually a 0.4 mm layer, I set 220 PWM for extruder, I need enough precision with enough speed, so I decreased feed rate to 28 mm/sec; now I have a problem about measures : if I build a rectangular cave box, to do a piece of square tube, I can see the external measures are right enough (1/10 mm about) but not the internal, I have about 9.2 instead of 10.0 mm, I cant understand why and what O might do to fix it.Please send me any suggestion.Regards
I’m surprised you are getting that close to 10mm. Cupcake is antique. The design is just awful. If you need sub-mm precision you should get a new printer.
Oh yes, I’m going to build a prusa with a my friend, but I need to investigate more deeply on all Skeinforge (or other slicing engine) settings…
yeah, you need to get up to date No one is using Skeinforge anymore. Look at Slic3r or Cura.
You need to move to a stepper extruder. Those old DC extruders are crap and don’t work reliably at a reduced duty cycle (255 or nothing). Other than old versions of skeinforge, you’re not likely to find slicer support for them either.
@Dario_Marrini There are still some of us out here printing on our , often heavily modified, Cupcakes. I agree that you really need a stepper extruder and go ahead and upgrade your electronics to something modern ( like a Printrboard ) and your printing life will be MUCH easier, and much more precise, not to mention quieter.
I am printing at speeds up to ~150mm/sec (usually only around 45-60 in reality) and can print down to 0.15mm layer thickness, on my cupcake.
If you are planning on using it for a while, I would also recommend upgrading the Z-axis with a Cantilever style, it will take care of any wobble you may be having.
many thanks for your helpes, at this point I need more knowledge about stepper extruder, that cantilever style and so on; about electronics, I wish to use real Arduino board + dedicated shields, I’ve bought a set for the birthing Prusa, Arduino Mega 2560 + RAMPS1.4 + stepper drivers; I hope this will be a correct way; if you wish to give me additional and deeper infos, I’ll appreciate that very much.
A Ramps 1.4 is a fine board. It’s hard to give you additional info without knowing what kind of info you need.
You’re right, I’ll make my mind a little clear, and then I’ll proceed for asking… no doubt about