Show all posts by user
(RepRap en Français)
Re: Hangprinter version 3 - 6 years ago
Hey guys, since you have a whole forum section available for the hangprinter, have you ever thought about making separated threads for each topic? That may be very helpful for new people joining the discussion, as well as for anyone trying to recover some specific technical information previously discussed. Cristianby cristian - Hangprinter
Re: Ninjaflex - Heated Bed? - 8 years ago
You must squeeze it very well on the bed and print the first layer slowly, but it is definitely doable, at least on glass + PVA glue.by cristian - Polymer Working Group
Re: Anyone still use the original smartrap? - 8 years ago
I do, although with some modifications on the extruder and Z axis.by cristian - Smart_Rap
Re: Copperfill - how much copper is in it? - 8 years ago
Yep, they apparently don't say it. Assuming that they put in the copperfill filament as much copper as they put bronze in their bronzefill, we can get a clue. Bronzefill has a density of 3.9g/cm3. If the PLA or whatever they mix has a density of about 1.4, and bronze more or less 8.5, then 1.4*(1 - x) + 8.5 * x = 3.9 --> x = 0.35 more or less, which is consistent with the percentage usedby cristian - Polymer Working Group
Re: CoreXY for bed instead of extruder(s), for small printer? - 8 years ago
QuoteJ-Max I will watch carefully to use proper terms in the future Me tooby cristian - CoreXY Machines
Re: CoreXY for bed instead of extruder(s), for small printer? - 8 years ago
Quotethe_digital_dentist I think that some of you guys are confusing precision, minimum feature size, minimum step size, resolution, and accuracy. Thanks for the clarification. My objective is then getting the best resolution for a small bed printer. QuoteVincentM Quotecristian For a printer with a small printing area (for example 100x100mm) and more than one extruder, in your opinion would itby cristian - CoreXY Machines
Re: Wanted: Crazy Ideas! I'm building another RepRap! - 8 years ago
Quotethe_digital_dentist Here's a crazy idea: how about making a small volume printer with an emphasis on high quality printing instead of lowest possible cost? Pull out all the stops and put the best stuff you can find into making it as ideal as possible. Design in things like absolute rigidity, slop free bearings, adequate bed heat, flat bed, quality extruder/hot-end, etc. Hey, that's my curby cristian - Developers
Re: Casting ABS plastic (possibly to recycle waste filament)? - 8 years ago
I am trying a different approach, that is melting the plastic inside the silicon mold already hot. The temperature of the mold is controlled via arduino board or similar. I will let you know in some weeks if this works reasonably with ABS, PLA, PC, PETG, etc.by cristian - General
Re: Are there any tools that can help me cut an OpenSCAD or STL in half for printing? - 8 years ago
What is the reason for not using Openscad itself to do the job?by cristian - 3D Design tools
Re: Every moderate length print failing - 8 years ago
Quoteo_lampe For me it seems like X and Y-axis are only the victims of the error, not the cause. I would take a closer look to the z-axis mechanic. Something is binding and causes the nozzle to run into the part, which makes the X and Y axis skip steps. -Olaf If X and Y were skipping steps, the print would not start back at the right position after some layers (or it would with infinitesimal proby cristian - Printing
Re: Prusa i3-rework: stampe "scalate" lungo Z - 8 years ago
Ciao, credo avrai più fortuna nel forum italiano.by cristian - Reprappers
Re: static torque when powered - 8 years ago
Or maybe the motor is instantly powered off by the board when the last command has been executed?by cristian - Reprappers
Re: Every moderate length print failing - 8 years ago
Do you have a heated bed?by cristian - Printing
Re: Best place to purchase Filament - 8 years ago
I find Colorfabb PLA/PHA filaments of very good quality, for ease of printing, negligible brittleness and delamination (in particular compared to ESUN PLA), and intense colors. They are available in several shops in many EU countries. ESUN is of course cheaper.by cristian - General
Re: Every moderate length print failing - 8 years ago
QuoteMichaelBrock Quotecristian Looks like an "almost" jamming hotend... I have broken down the hotend 3 or 4 times to clean up the molten mess that usually results, including the nozzle. By "almost" jamming do you mean that the filament might be temporarily catching on something and prevening it from extruding? I'll break it down again and check it out. There are many shades of "jamming hotby cristian - Printing
Re: Every moderate length print failing - 8 years ago
Looks like an "almost" jamming hotend...by cristian - Printing
Re: Accuracy test - 8 years ago
I forgot: the bed is bent. But I have a great hotend that never jams no matter how much I overextrude or overheat, so I can squeeze it on the bed with no consequences. With a raft I manage to print pieces about 10x18 cm. The fishing line is one of the most successful improvements to my printer, however it supposedly works only if Z bearings can slide very smoothly.by cristian - Printing
Re: Accuracy test - 8 years ago
In this thread there are several pictures, with the last improvements at the end of the thread. My printer is probably the perfect heap of all the things that should not be done for a reliable 3d printer design: structure made of plastic parts and wood, cantilevered bed and Y axis, loose linear bearings, loose belts (I cannot stretch them too much or the structure bends)... What else? My next priby cristian - Printing
Re: Is it Wobble? Banding? - 8 years ago
QuoteVashikovich Quotecristian Heated bed? yes. I was suspecting temperature, but the temp graph seems very stable. Can you see a correlation between the banding and the times when the heating of the bed is turned on/off?by cristian - Printing
Re: Accuracy test - 8 years ago
Quotethe_digital_dentist How fast did you print it? If it is the frame wobbling, a lower print speed may help keep it under control. 30mm/s. No hope I thinkby cristian - Printing
Re: Is it Wobble? Banding? - 8 years ago
Do you use auto bed leveling? In that case, does the banding occur if you disable it? Or do you use a geared extruder? In that case, is the banding the same if you print with infill?by cristian - Printing
Re: Accuracy test - 8 years ago
In my case I think the wobble comes from the weakness of the structure. The printer is a smartrap of the first generation, with cantilevers everywhere. I got rid of Z wobble by using spectra line instead of a threaded rod, which seems to work very well but clearly it is not the only issue.by cristian - Printing
Accuracy test - 8 years ago
I wrote a small test (see ) to check the precision of my printer. The test is thought to discover in particular some kind of hysteresis (backlash, uneven belt tension, etc.) by making the hotend go backward and forward from one side of the bed to the other. However I discovered that the overall precision of my printer is so low that hysteresis is the least of my problems: (0.2mm layer height)by cristian - Printing
Re: Prusa i3 uneven layers and gaps. - 8 years ago
Too few perimeters? Do the waves change if you change the infill percentage? Or backlash in a geared extruder?by cristian - Reprappers
Re: CoreXY for bed instead of extruder(s), for small printer? - 8 years ago
QuoteJ-Max Why not a XYbed ? It shoulld work anyways. Well the idea (not necessarily a good one) was to have more than one direct extruder (no Bowden). In that case, a small bed may be lighter than the extruders with motors.by cristian - CoreXY Machines
Re: Bearing friction torque - 8 years ago
Okay, I did my homework. I set up a system like this and I tried to measure static friction torque. It turned out to be quite a difficult thing to measure "at home" on 608 ball bearings, because of all the possible alignment errors between the bearings and the line as well as the "noise" on the measure, given by the non homogeneous static friction in relation to the rotation angle of the beariby cristian - Mechanics
Re: Printer stops and doesn t continue - 8 years ago
No problems when printing smaller objects? What about another object printed close to the border where the hotend stopped? Did you have a look at the log for errors?by cristian - Printing